Question

[A Thuw]

Sắp xếp các phân số sau theo thứ tự từ bé đến lớn :

a,6/8;7/9;10/12;11/13;17/19

b,21/13;3/5;7/9;9/10;1/3;4/20

Answer 1

[Nguyễn Lê Phước Thịnh]

a: 6/8=1-2/8

7/9=1-2/9

10/12=1-2/12

11/13=1-2/13

17/19=1-2/19

2/8>2/9>2/12>2/13>2/19

=>-2/8<-2/9<-2/12<-2/13<-2/19

=>6/8<7/9<10/12<11/13<17/19

b: 3/5=54/90; 7/9=70/90; 9/10=81/90; 1/3=30/90; 4/20=1/5=18/90

=>4/20<1/3<3/5<7/9<9/10<21/13