5/100(y-1)=37/100(y+1)+0.1
0.65y-0.65=0.37y+0.37+0.10.28y=0.65+0.37+0.1=1.12
y=1.12/0.28
y =4
但愿能帮到你,祝你学习进步,不懂再问O(∩_∩)O~