Respostas

2014-08-17T20:32:52-03:00
A) 2a-3b+5c+3b-2a-4c+d
2a-2a-3b+3b+5c-4c+d
c+d

B)3a.(-2ab)
-6a²b

C) (x+10.(x-1)
10x.(x-1)
10x²-10
10x²=10
x²=10/10
x²=1

D) (a-b)2
2a-2b
A melhor resposta!
2014-08-17T22:38:22-03:00
A) 2a  - 3b + 5c + 3b - 2a - 4c + d > 
    2a-2a-3b+3b+5c-4c+d >
    c + d
b) 3a(-2ab) =  - 3a²b
c) (x+1)(x-1) = x² - 1² ou x² - 1
d)(a-b)²=  a² - 2ab + b² 

Bons estudos!
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