Question

Tính bằng cach thuận tiện 

        1/2 : 3/4 - 1/6 : 3/4

Answer 1

1/2:3/4-1/6:3/4

=(1/2-1/6):3/4

=1/3:3/4

=1/3x4/3

=4/9

Answer 2

1/2 : 3/4 - 1/6 : 3/4

= (1/2-1/6):3/4

= 1/3 : 3/4

= 4/9