Question

Answer 1

D

Answer 2

D

 

Answer 3

A \(\dfrac{-1}{70}\)

Answer 4

\(\dfrac{1}{2}+\dfrac{1}{5}+\dfrac{-5}{7}=\dfrac{35}{70}+\dfrac{14}{70}+\dfrac{-50}{70}=-\dfrac{1}{70}\)

`=> A`

Answer 5

\(\dfrac{1}{2}+\dfrac{1}{5}+\dfrac{-5}{7}=\dfrac{35}{70}+\dfrac{14}{70}+\dfrac{-50}{70}=\dfrac{49}{70}+\dfrac{-59}{70}=-\dfrac{10}{70}=-\dfrac{1}{7}\)

Answer 6

A

Answer 7

d