,是÷吗?表述不是太清楚,还有括号问题,按除号计算了
3a(x+y)的3m+1次方·(x-y)的2n+1次方÷(x+y)的2m+3次方·（x-y）的5N-1次方·[-4b(x-y)的3次方]
=3a(x+y)^(3m+1)*(x-y)^(2n+1)÷(x+y)^(2m+3)*(x-y)^(5n-1)*[(-4b)(x-y)^3]
=3a*(x+y)^(3m+1-2m-3)*(x-y)^(2n+1+5n-1+3)*(-4b)
=-12ab*(x+y)^(m-2)*(x-y)^(7n+3)那个~ 也是· 乘号 打错了按乘号计算如下：=3a(x+y)^(3m+1)*(x-y)^(2n+1)*(x+y)^(2m+3)*(x-y)^(5n-1)*[(-4b)(x-y)^3]=-12ab*(x+y)^(3m+1+2m+3)*(x-y)^(2n+1+5n-1+3)=-12ab(x+y)^(5m+4)*(x-y)^(7n+3)清楚吗？恩 谢谢不客气