1/3(9y-3)-2(y-1)=?
问题描述：
1/3(9y-3)-2(y-1)=?
|-7/9|÷(2/3-1/5)-1/3*(-4)二次方
答
=1/3(9y-3)-2y+2
=3y-1-2y+2
=y+1
=7/9除以7/15-1/3*16
=5-16/3
= -1/3