Question

[(6x-18):3+25]2=78

Answer 1

`[(6x-18):3 + 25] . 2 = 78`

`=> (6x - 18):3 + 25= 78 : 2`

`=> (6x-18):3 + 25 = 39`

`=> (6x - 18): 3 = 39 - 25`

`=> (6x-18) : 3 = 14`

`=> 6x - 18 = 14 . 3`

`=> 6x - 18 = 42`

`=> 6x = 42 + 18`

`=> 6x=60`

`=>x=60:6`

`=>x=10`

Vậy: `x=10`

Answer 2

\(\left[\left(6x-18\right):3+25\right].2=78\)
\(\Rightarrow\left(6x-18\right):3+25=78:2\)
\(\Rightarrow\left(6x-18\right):3+25=39\)
\(\Rightarrow\left(6x-18\right):3=39-25\)
\(\Rightarrow\left(6x-18\right):3=14\)
\(\Rightarrow6x-18=14.3\)
\(\Rightarrow6x-18=42\)
\(\Rightarrow6x=42+18\)
\(\Rightarrow6x=60\)
\(\Rightarrow x=60:6\)
\(\Rightarrow x=10\)
Vậy .....