2x-3/x+3-2x/5怎么做
问题描述:
2x-3/x+3-2x/5怎么做
答
(2x-3)/(x+3)-2x/5
=[5(2x-3)-2x(x+3)]/5(x+3)
=(10x-15-2x²-6x)/5(x+3)
=(-2x²+4x-15)/5(x+3)