(x-2xy)²×x-(9xy的三次方-12x四次方y²)÷3xy-(2xy)²×x x=2,y=1

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(x-2xy)²×x-(9xy的三次方-12x四次方y²)÷3xy-(2xy)²×xx=2,y=1(x-2xy)²×x-(9xy的三次方-12x四次方y

(x-2xy)²×x-(9xy的三次方-12x四次方y²)÷3xy-(2xy)²×x x=2,y=1
(x-2xy)²×x-(9xy的三次方-12x四次方y²)÷3xy-(2xy)²×x x=2,y=1

(x-2xy)²×x-(9xy的三次方-12x四次方y²)÷3xy-(2xy)²×x x=2,y=1
=x(x²-4x²y+4x²y²)-(3y²-4x³y)-4x²y²×x
=x³-4x³y+4x³y²-3y²+4x³y-4x³y²
=x³-3y²

靠~~那么难,你几年级的?