X x 2 + X : 0,5 =10
X x 2 + X x 2 = 10
X x ( 2 + 2 ) =10
X x 4 = 10
x =10 : 4
x = 2,5
^ - ^
X x 2 + X : 0,5 = 10
X x 2 + X x 2 = 10
X x (2+2) = 10
X x 4 = 10
X = 10 : 4
X = 2,5
X x 2+X :0,5 = 10
X x 2 + X x 2 = 10
X x ( 2+ 2) = 10
X x 4 = 10
X =10: 4 =2.5
Vậy x= 2,5