若(-5x^m+1)(y^2n-1)*(2x^n)(y^m)=-10(x^4)(y^4),试求m-n的值
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若(-5x^m+1)(y^2n-1)*(2x^n)(y^m)=-10(x^4)(y^4),试求m-n的值
若(-5x^m+1)(y^2n-1)*(2x^n)(y^m)=-10(x^4)(y^4),试求m-n的值
若(-5x^m+1)(y^2n-1)*(2x^n)(y^m)=-10(x^4)(y^4),试求m-n的值
若(-5x^m+1)(y^2n-1)*(2x^n)(y^m)=-10(x^4)(y^4),试求m-n的值
所以m+1+n=4;
m+n=3;
2n-1+m=4;
m+2n=5;
n=2;
m=1;
所以m-n=1-2=-1;
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