10x + $2^{2}$ .5 = 102

2 câu trả lời

`10x + 2^2 . 5 = 102`

`10x + 4 . 5 = 102`

`10x + 20 = 102`

`10x = 102 - 20`

`10x = 82`

`x = 82 : 10`

`x = 8,2`

 

`10x+2^2 . 5=10^2`

`->10x+4.5=100`

`->10x+20=100`

`->10x=100-20`

`->10x=80`

`->x=80:10`

`->x=80/10`

`->x=8`

Vậy `x=8`