Question

a) 187 + x = 320                  b) 765 - x = 158
              c) 451 + (x - 218) = 876

Answer 1

`#3107.101107`

`a)`

\(187+x=320\\ \Rightarrow x=320-187\\ \Rightarrow x=133\)

Vậy, `x = 133`

`b)`

\(765-x=158\\ \Rightarrow x=765-158\\ \Rightarrow x=607\)

Vậy, `x = 607`

`c)`

\(451+\left(x-218\right)=876\\ \Rightarrow x-218=876-451\\ \Rightarrow x-218=425\\ \Rightarrow x=425-218\\ \Rightarrow x=207\)

Vậy, `x = 207.`