Versionen från 21 juni 2007 kl. 15.07 (redigera) KTH.SE:u1xsetv1 (Diskussion | bidrag) ← Gå till föregående ändring |
Nuvarande version (25 juni 2007 kl. 12.10) (redigera) (ogör) KTH.SE:u1xsetv1 (Diskussion | bidrag) |
(13 mellanliggande versioner visas inte.) |
Rad 1: |
Rad 1: |
| + | __NOTOC__ |
| + | |
| ==Övning 2.1:1== | | ==Övning 2.1:1== |
| <div class="ovning"> | | <div class="ovning"> |
Rad 671: |
Rad 673: |
| </tr> | | </tr> |
| <tr><td height="5px"/></tr> | | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | |
| + | ==Övning 2.3:1== |
| + | |
| + | <div class="ovning"> |
| + | Kvadratkomplettera följande uttryck |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="25%">$x^2-2x$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="25%">$x^2+2x-1$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="25%">$5+2x-x^2$</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="25%">$x^2+5x+3$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="25%">$(x-1)^2-1$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="25%">$(x+1)^2-2$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="25%">$-(x-1)^2+6$</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="25%">$\bigl(x+\frac{5}{2}\bigr)^2-\frac{13}{4}$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | ==Övning 2.3:2== |
| + | |
| + | <div class="ovning"> |
| + | Lös följande andragradsekvationer med kvadratkomplettering |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="33%">$x^2-4x+3=0$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%">$y^2+2y-15=0$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%">$y^2+3y+4=0$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="33%">$4x^2-28x+13=0$</td> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="33%">$5x^2+2x-3=0$</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="33%">$3x^2-10x+8=0$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr><td height="5px"/></tr> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="33%">$\left\{ \eqalign{ x_1 &= 1 \cr x_2 &= 3\cr }\right.$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%">$\left\{ \eqalign{ y_1 &= -5 \cr y_2 &= 3\cr }\right.$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%"> saknar (reella) lösning</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="33%">$ \left\{ \eqalign{ x_1 &= \textstyle\frac{1}{2}\cr x_2 &= \textstyle\frac{13}{2}\cr }\right.$</td> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="33%">$\left\{ \eqalign{ x_1 &= -1 \cr x_2 &= \textstyle\frac{3}{5}\cr }\right.$</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="33%">$ \left\{ \eqalign{ x_1 &= \textstyle\frac{4}{3}\cr x_2 &= 2\cr }\right.$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | ==Övning 2.3:3== |
| + | |
| + | <div class="ovning"> |
| + | Lös följande ekvationer direkt |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="50%">$x(x+3)=0$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$(x-3)(x+5)=0$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="50%">$5(3x-2)(x+8)=0$</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="50%">$x(x+3)-x(2x-9)=0$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="50%">$(x+3)(x-1)-(x+3)(2x-9)=0$</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="50%">$x(x^2-2x)+x(2-x)=0$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="50%">$\left\{ \eqalign{ x_1 &= 0 \cr x_2 & = -3\cr }\right.$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$\left\{ \eqalign{ x_1 &= 3 \cr x_2 & = -5\cr }\right. $</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="50%">$\left\{ \eqalign{ x_1 & = \textstyle\frac{2}{3} \cr x_2 & = -8\cr }\right. $</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="50%">$\left\{ \eqalign{ x_1 & = 0\cr x_2 & = 12\cr }\right. $</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="50%">$\left\{ \eqalign{ x_1 & = -3 \cr x_2 & = 8\cr }\right. $</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="50%">$\left\{ \eqalign{ x_1 & = 0 \cr x_2 & = 1 \cr x_3 & = 2 }\right. $</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | ==Övning 2.3:4== |
| + | |
| + | <div class="ovning"> |
| + | Bestäm en andragradsekvation som har rötterna |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="100%">$-1\ $ och $\ 2$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="100%">$1+\sqrt{3}\ $ och $\ 1-\sqrt{3}$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="100%">$3\ $ och $\ \sqrt{3}$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="100%">$ax^2-ax-2a=0\,$, där $\,a\ne 0\,$ är en konstant.</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="100%">$ax^2-2ax-2a=0\,$, där $\,a\ne 0\,$ är en konstant.</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="100%">$ax^2-(3+\sqrt{3}\,)ax+3\sqrt{3}\,a=0\,$, där $\,a\ne 0\,$ är en konstant.</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | ==Övning 2.3:5== |
| + | |
| + | <div class="ovning"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="100%">Bestäm en andragradsekvation som bara har $\,-7\,$ som rot.</td> |
| + | </tr> |
| + | <tr> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="100%">Bestäm ett värde på $\,x\,$ som gör att uttrycket $\,4x^2-28x+48\,$ är negativt.</td> |
| + | </tr> |
| + | <tr> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="100%">Ekvationen $\,x^2+4x+b=0\,$ har en rot $\,x=1\,$. Bestäm värdet på konstanten $\,b\,$.</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="100%">Exempelvis $\ x^2+14x+49=0\,$.</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="100%">$3< x<4$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="100%">$b=-5$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | ==Övning 2.3:6== |
| + | |
| + | <div class="ovning"> |
| + | Bestäm det minsta värde som följande polynom antar |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="33%">$x^2-2x+1$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%">$x^2-4x+2$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%">$x^2-5x+7$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | |
| + | </div> |
| + | |
| + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="33%">$0$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%">$-2$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%">$\displaystyle \frac{3}{4}$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | ==Övning 2.3:7== |
| + | |
| + | <div class="ovning"> |
| + | Bestäm det största värde som följande polynom antar |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="33%">$1-x^2$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%">$-x^2+3x-4$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%">$x^2+x+1$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="33%">$1$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%">$\displaystyle -\frac{7}{4}$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%">saknar max</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | ==Övning 2.3:8== |
| + | |
| + | <div class="ovning"> |
| + | Skissera grafen till följande funktioner |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="33%">$f(x)=x^2+1$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%">$f(x)=(x-1)^2+2$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%">$f(x)=x^2-6x+11$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td>Se lösningen i |
| + | webmaterialet när du loggat in till kursen.</td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | |
| + | ==Övning 2.3:9== |
| + | |
| + | <div class="ovning"> |
| + | Hitta alla skärningspunkter mellan x-axeln och kurvan |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="33%">$y=x^2-1$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%">$y=x^2-5x+6$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%">$y=3x^2-12x+9$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="33%">$(-1,0)\ $ och $\ (1,0)$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%">$(2,0)\ $ och $\ (3,0)$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%">$(1,0)\ $ och $\ (3,0)$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | ==Övning 2.3:10== |
| + | |
| + | <div class="ovning"> |
| + | Rita in i ett ''xy''-plan alla punkter vars koordinater $\,(x,y)\,$ uppfyller |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="50%">$y \geq x^2\ $ och $\ y \leq 1 $</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$y \leq 1-x^2\ $ och $\ x \geq 2y-3 $</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="50%">$1 \geq x \geq y^2 $</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="50%">$x^2 \leq y \leq x $</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td>Se lösningen i webmaterialet när du loggat in till kursen</td> |
| + | </tr> |
| </table> | | </table> |
| </div> | | </div> |