1.4x^2n-1·y^2n+1分之0.8x^2n·y^2n-1
问题描述:
1.4x^2n-1·y^2n+1分之0.8x^2n·y^2n-1
答
=4/7*x^(2n-2n+1)y^(2n+1-2n+1)
=4xy^2/7