Question

tính thuận tiện

4/9 -3/7 nhân 2/3 - 3/7

4/15 + 2/3 + 6/15

Answer 1

( 3/7 - 3/7 ) - 4/9 x 2/3

= 0 - 4/7 X 2/3

= 0 - 8/21

= -8/21

 

( 4/15 + 6/15) + 2/3

= 1/3 + 2/3

= 3/3 = 1

Answer 2

( 3/7 - 3/7 ) - 4/9 x 2/3

= 0 - 4/7 X 2/3

= 0 - 8/21

= -8/21

 

( 4/15 + 6/15) + 2/3

= 1/3 + 2/3

= 3/3 = 1