已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值

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已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值

已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值
已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值

已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值
(2x-y)³-(2x-y)²(x-3y)
=(2x-y)²[(2x-y)-(x-3y)]
=(2x-y)²(x+2y)
=10²×11
=1100

(2x-y)³-(2x-y)²(x-3y)=(2x-y)²(x+2y)=100*11=1100

(2x-y)³-(2x-y)²(x-3y)
=(2x-y)²(2x-y-x+3y)
=(2x-y)²(x+2y)
=10²×11
=1100