Question

   Câu 9: Tính bằng cách  thuận tiện

14/17:17/32-14/17:17/15

 

Answer 1

14/17.32/17-14/17.15/17

=14/17.(32/17-15/17)

=14/17.1=14/17

Answer 2

14/17 : 17/32 - 14/17 : 17/15

= 14/17 : (17/32 - 17/15)
= 14/17 : (-289/480)
= -960/289

Answer 3

=14/7:(32/15-17/15)

=14/7:1

=14/7

hc tốt