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Solution 1.1:2c

From Förberedande kurs i matematik 1

Revision as of 08:06, 9 September 2008 by Tekbot (Talk | contribs)
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Hela uttrycket kan vi dela upp i två delar

\displaystyle \bbox[#FFEEAA;,1.5pt]{\,3\cdot(-7)\,}-\bbox[#FFEEAA;,1.5pt]{\,4\cdot(6-5)\,}

som vi kan räkna ut separat och sedan subtrahera från varandra.

Det första deluttrycket är lika med

\displaystyle 3\cdot(-7) = -21

medan det andra deluttrycket blir

\displaystyle 4\cdot(6-5) = 4\cdot 1 = 4\,.

Sammantaget får vi

\displaystyle \bbox[#FFEEAA;,1.5pt]{\,3\cdot(-7)\,}-\bbox[#FFEEAA;,1.5pt]{\,4\cdot(6-5)\,} = \bbox[#FFEEAA;,1.5pt]{\,-21\,}-\bbox[#FFEEAA;,1.5pt]{\,4\,} = -25\,.
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