初二数学题'easy(²为平方,³为立方)计算题1.(x+1)(x+6) 2.(-6x²)²+(-3³)·x3、(x-2y)²-(x-2y)(x+2y)-2x(2x-y).^

问题描述:

初二数学题'easy(²为平方,³为立方)计算题
1.(x+1)(x+6) 2.(-6x²)²+(-3³)·x3、(x-2y)²-(x-2y)(x+2y)-2x(2x-y).^

1.原式=x²+6x+x+6=x²+7x+6
2.原式=36x四次方+(-27)·x=36x四次方-27x
3.原式=x²-4xy+4y²-(x²-4y²)-(4x²-2xy)
=-4xy+8y²-4x²+2xy
=-4x²-2xy+8y²