(-5a的m+1次幂b的2m-1)*(2a的n次幂b的m次幂)=-10a的4次幂b的4次幂.則m-n=?

(-5a的m+1次幂b的2m-1)*(2a的n次幂b的m次幂)=-10a的4次幂b的4次幂.則m-n=?

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