Question

3/7 nhân 5/4-5/14

2/7 nhân x=2/3

Chịu rùi

Answer 1

3/7 x 5/4 - 5/14 = 15/28 - 5/14

                             =   10/28 = 5/14

Answer 2

2/7 x X = 2/3

        X = 2/3 : 2/7 

        X =   7/3

Answer 3

(3/7.5/4)-5/14

=15/28-5/14

=15/28-10/28

=5/28

**********

2/7.x=2/3

=) x=2/3:2/7

=) x=2/3.7/2

=) x=14/6