Question

Giải câu a và câu e mình với

Answer 1

a) `1/7+(-4/7) = (1-4)/7=-3/7`

e) `-1/16-1/15 = -15/(16.15) - 16/(15.16)`

`=(-15-16)/(16.15)`

`=-31/240`

Answer 2

-31/240
 

Answer 3

\(a.\dfrac{1}{7}+\dfrac{-4}{7}=\dfrac{-3}{7}\\ b.\dfrac{-1}{16}-\dfrac{1}{15}=\dfrac{-31}{240}\)

Answer 4

a) 1/7+-4/7=-3/7

b)-1/16-1/15=-15/240-16/240=-31/240

Answer 5

a) \(\dfrac{1}{7}+\dfrac{-4}{7}=\dfrac{-3}{7}\)

e) \(\dfrac{-1}{16}-\dfrac{1}{15}=\dfrac{-15}{240}-\dfrac{16}{240}=\dfrac{-31}{240}\)

 

 

Answer 6

Giải:

a) \(\dfrac{1}{7}+\dfrac{-4}{7}=\dfrac{1+\left(-4\right)}{7}=\dfrac{-3}{7}\) 

e) \(\dfrac{-1}{16}-\dfrac{1}{15}=\dfrac{-15}{240}-\dfrac{16}{240}=\dfrac{-15-16}{240}=\dfrac{-31}{240}\)