Question

TRẢ LỜI GIÚP MÌNH NHÉ

 a] [2/5 +7/9] +3/5 =

b] 19/11 + [8/13 +3/11]=

c] 12/19 - 19/7=

thank you các bạn

Answer 1

a.

 ( 2/5 + 7/9 ) + 3/5 

= ( 18/45 + 35/45 ) + 3/5

= 53/45 + 3/5

= 53/45 + 27/45

= 80/45 = 16/9

[ ... ] tương tự. Lười wá!  

Answer 2

a. [2/5+7/9]+3/5

=[18/45+35/45]+3/5

=53/45+3/5

=53/45+27/45

=80/45=16/9

b. 19/11+[8/13+3/11]

=19/11+[88/143+39/143]

=19/11+127/43

=817/473+1397/473

=2196/473

c. 12/19-19/7

=12-1/7

=84/7-1/7

=83/7