计算x-[y-2x-(x-y)]还有:(a^b-3ab^2)-3(2a^2b-7ab^2)

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计算x-[y-2x-(x-y)]还有:(a^b-3ab^2)-3(2a^2b-7ab^2)计算x-[y-2x-(x-y)]还有:(a^b-3ab^2)-3(2a^2b-7ab^2)计算x-[y-2x-

计算x-[y-2x-(x-y)]还有:(a^b-3ab^2)-3(2a^2b-7ab^2)
计算x-[y-2x-(x-y)]
还有:(a^b-3ab^2)-3(2a^2b-7ab^2)

计算x-[y-2x-(x-y)]还有:(a^b-3ab^2)-3(2a^2b-7ab^2)
x-[y-2x-(x-y)]
=x-(y-2x-x+y)
=x-y+2x+x-y
=4x-2y
(a²b-3ab²)-3(2a²b-7ab²)
=a²b-3ab²-6a²b+21ab²
=(a²b-6a²b)-(3ab²-21ab²)
=-5a²b+18ab²
=18ab²-5a²b
=ab(18b-5a)