3x*(-4x^3y^2)^2-(2x^2y)^3*5xy,其中x=1,y=-2
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3x*(-4x^3y^2)^2-(2x^2y)^3*5xy,其中x=1,y=-2
3x*(-4x^3y^2)^2-(2x^2y)^3*5xy,其中x=1,y=-2
3x*(-4x^3y^2)^2-(2x^2y)^3*5xy,其中x=1,y=-2
3x*(-4x^3y^2)^2-(2x^2y)^3*5xy
=3x*(16x^6y^4)-(8x^6y^3)*5xy
=48x^7y^4-40x^7y^4
=8x^7y^4
=8*1^7*(-2)^4
=8*16
=128
x(x-y)2-(y-x)3
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