已知y1=5x+2,y2=1/2x-3.
问题描述:
已知y1=5x+2,y2=1/2x-3.
当x取何值时y1=y2?
当X取何值时y1比y2小3?
答
5x+2=1/2x-3
9/2x+5=0
9/2x=-5
x=-10/9
5x+2=1/2x-3-3
x=-16/9