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2009-12-20T21:26:33+01:00
A)-3ab(-6a²-2ab-b²)-(3ab³+6a²b2)
18a3b+6a2b2+3ab3-3ab3-6a2b2=18a3b
b)6a(5a²-8b)-10a(6b+7a²)-3ab
30a3-48ab-60ab-70a3-3ab=-40a3-111ab
c)[(8x³-4x²y²)-2(3x²y²+4x³)]*(-2x²y²)
[8x3-4x2y2-6x2y2-8x3]*(-2x²y²)=
(-10x2y2)*(-2x²y²)=20x4y4
d)4c-2(c-3)-3[c-3(4-2c)+8]=
4c-2c+6-3[c-12+6c+8]=
2c+3[7c-4]=2c+21c-12=23c-12
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