Respostas

2013-07-06T23:34:23-03:00
2x(a-3b)+3a(2x-5a)-12
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2ax-6ab+6ax-15a²-12
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2ax: 2x*a
-6ab:2x*3b
6ax:3a*2x
-15a:3a*5a
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-15a²-8ax-6ab-12
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-8ax: 6ax+2ax

R.:-15a²-8ax-6ab-12