初一一道计算(过程详细)[(1/9(x+y)^3-2(x+y)^2-2/3(x+y)]÷x+y/3 x+y/3 x+y是整体..

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初一一道计算(过程详细)[(1/9(x+y)^3-2(x+y)^2-2/3(x+y)]÷x+y/3x+y/3x+y是整体..初一一道计算(过程详细)[(1/9(x+y)^3-2(x+y)^2-2/3(

初一一道计算(过程详细)[(1/9(x+y)^3-2(x+y)^2-2/3(x+y)]÷x+y/3 x+y/3 x+y是整体..
初一一道计算(过程详细)
[(1/9(x+y)^3-2(x+y)^2-2/3(x+y)]÷x+y/3
x+y/3
x+y是整体..

初一一道计算(过程详细)[(1/9(x+y)^3-2(x+y)^2-2/3(x+y)]÷x+y/3 x+y/3 x+y是整体..
[(1/9(x+y)^3-2(x+y)^2-2/3(x+y)]/[(x+y)/3]
=(x+y)[1/9(x+y)^2-2(x+y)-2/3]/[(x+y)/3]
=[1/9(x+y)^2-2(x+y)-2/3]/[1/3]
=3*[1/9(x+y)^2-2(x+y)-2/3]
=(x+y)^2/3-6(x+y)-2
=x^2/3+2xy/3+y^2/3-6x-6y-2

[(1/9(x+y)^3-2(x+y)^2-2/3(x+y)]÷[(x+y)/3]
=[(1/9)*3)](x+y)^2-2*3(x+y)-(2/3)*3
=(x+y)^2/3-6x-6y-2
=x^2/3+2xy/3+y^2/3-6x-6y-2.

不好意思 这个太难写了