Question

tinh

9/20-8/15x5/12=

2/3:4/5:7/12=

4/9+11/8-5/6=

Answer 1

a.9/20-8/15x5/12

=9/20-2/9

=41/180

b.2/3:4/5:7/12

=5/6:7/12

=10/7

c.4/9+11/8-5/6

=131/72-5/6

=71/72

tk mk nhé bạn

Answer 2

39/180

120/84

71/72

Answer 3

9/20 - 8/15 x 5/12 = 9/20 - 2/9

                             = 81/180 - 40/180

                             = 41/180

2/3  : 4/5 : 7/12 = 2/3 x 5/4 : 7/12

                         = 5/6 : 7/12

                         = 5/6 x 12/7

                         = 10/7

4/9 + 11/8 - 5/6 = 32/72 + 99/72 - 60/72

                         = 71/72