∵-4x^(5m)y^(3m-n)÷[-2x^(m+2n)y^(2m+n)] =(-4)/(-2)*x^(5m)/x^(m+2n)* y^(3m-n)/y^(2m+n)=2x^(5m-m-2n)y^(3m-n-2m-n)=2x^(4m-2n)y^(m-2n)又-4x^(5m)y^(3m-n)÷[-2x^(m+2n)y^(2m+n)] 的商与-1/2x^3y^2次方是同类项∴4m-2n=3, 且m-2n=2解得m=1/3,n=-5/6∴m+n=-1/2
看图