Question

一.1.小星和小莉看课外书,小星看了40页,是小莉所看页数的5分之4.小莉看了多少页?

Answer 1

1.40/(4/5)=50

2.设小莉看了x页,(40-x)/x=1/4,x=32

3.设小莉看了x页, (x-40)/x=1/5,x=50

4.设小莉看了x页,(x-40)/40=1/5,x=48

5.设全场x米,3/10*x+1/5*x=120,x=240

6.设共有x个,1/4*x+300=x,x=400

7.20*(1/2)+7/3=10又3分之7

8.设甲乙两地相距x千米,1/3*x+1/4*x+20=x,x=48

记得采纳,O(∩_∩)O哈哈~