若(-5x^m+1×y^2-1)×(2x^n×y^m)=-10x^4y^4,试求m-n的值.x^3-2x[2x^2-3(x^2-2x-3)] (闲着无聊 送10玩玩)

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若(-5x^m+1×y^2-1)×(2x^n×y^m)=-10x^4y^4,试求m-n的值.x^3-2x[2x^2-3(x^2-2x-3)](闲着无聊送10玩玩)若(-5x^m+1×y^2-1)×(2

若(-5x^m+1×y^2-1)×(2x^n×y^m)=-10x^4y^4,试求m-n的值.x^3-2x[2x^2-3(x^2-2x-3)] (闲着无聊 送10玩玩)
若(-5x^m+1×y^2-1)×(2x^n×y^m)=-10x^4y^4,试求m-n的值.x^3-2x[2x^2-3(x^2-2x-3)] (闲着无聊 送10玩玩)

若(-5x^m+1×y^2-1)×(2x^n×y^m)=-10x^4y^4,试求m-n的值.x^3-2x[2x^2-3(x^2-2x-3)] (闲着无聊 送10玩玩)
若(-5x^m+1×y^2-1)×(2x^n×y^m)=-10x^4y^4,试求m-n的值.
m+1+n=4;
2-1+m=4;
m=3;
n=0;
∴m-n=3-0=3;
x^3-2x[2x^2-3(x^2-2x-3)]
=x³-4x³+6x³-12x²-18x
=3x³-12x³-18x
=3x(x²-4x-6)
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