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5x(x²-2)-(-2x)²×(x-1)-x³=2x(2x-1)+2
5x³-10x-4x²×(x-1)-x³=2x²-2x+2
5x³-10x-4x³+4x²-x³ =2x²-2x+2
-10x+4x²-2x²+2x =2
-8x+2x² =2
(4x-x²)=-1
5x³-10x-4x²×(x-1)-x³=2x²-2x+2
5x³-10x-4x³+4x²-x³ =2x²-2x+2
-10x+4x²-2x²+2x =2
-8x+2x² =2
(4x-x²)=-1
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