-3m^2n/5+m^2n-mn^2
问题描述:
-3m^2n/5+m^2n-mn^2
烦,做不出来
2(x-1)-3(2-3x)
答
-3m^2n/5+m^2n-mn^2
=(1-3/5)m^2n-mn^2
=(3/5)m²n-mn²
2(x-1)-3(2-3x)
=2x-2-6+9x
=11x-8