如果x-y=3,xy=5,(3x-4y+5xy)-(2x-3y)+5xy=?
问题描述:
如果x-y=3,xy=5,(3x-4y+5xy)-(2x-3y)+5xy=?
急求要完整的过程
答
(3x-4y+5xy)-(2x-3y)+5xy
=3x-4y+5xy-2x+3y+5xy
=x-y+10xy
=3+10*5
=53