29,5-x*0,25=20,5; 3,75+x*0,5=18,25; 125,75-12,5*x=100,25; 27,5-20,7:x=10,25; 102,7-x:1,5=87,62; 38,23+x:2,5=42,76; (x-7,025)*2,5=27,75; x-18,5*2,2=88,88; GIÚP>.<

`29,5-x xx0,25=20,5`

`x :4=29,5-20,5`

`x:4=9`

`x=9xx4`

`x=36`

`-` Vậy : `x=36.`

____________________________

`3,75+x xx0,5=18,25`

`x:2=18,25-3,75`

`x:2=14,5`

`x=14,5xx2`

`x=29`

`-` Vậy : `x=29.`

_____________________________

`125,75-12,5xx x=100,25`

`12,5xx x=125,75-100,25`

`12,5 xx x=25,5`

`x=25,5:12,5`

`x=2,04`

`-` Vậy : `x=2,04.`

_____________________________

`27,5-20,7:x=10,25`

`20,7:x=27,5-10,25`

`20,7:x=17,25`

`x=20,7:17,25`

`x=1,2`

`-` Vậy : `x=1,2.`

______________________________

`102,7-x:1,5=87,62`

`x:1,5=102,7-87,62`

`x:1,5=15,08`

`x=15,08xx1,5`

`x=22,62`

`-` Vậy : `x=22,62.`

______________________________

`38,23+x:2,5=42,76`

`x:2,5=42,76-38,23`

`x:2,5=4,53`

`x=4,53xx2,5`

`x=11,325`

`-` Vậy : `x=11,325.`

_______________________________

`(x-7,025)xx2,5=27,75`

`x-7,025=27,75:2,5`

`x-7,025=11,1`

`x=11,1+7,025`

`x=18,125`

`-` Vậy : `x=18,125.`

_______________________________

`x-18,5xx2,2=88,88`

`x-40,7=88,88`

`x=88,88+40,7`

`x=129,58`

`-` Vậy : `x=129,58.`

`#Sal_tSea`