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
40÷4/5=50页
0
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
40÷4/5=50页