=> 3/4.x - 1/2.x = 2,5
=> 1/4.x = 2,5
=> x = 2,5 : 1/4
=> x = 2,5 . 4
=> x = 10
dấu .=x ( nhân )
3/4x-1/2x=5/2
x.(3/4-1/2)=5/2
x.1/4=5/2
x=5/2:1/4
x=5/2.4/1
x=10/1
đúng thì tích nha
75%x - 1/2x = 2,5
3/4x - 1/2x = 5/2
x . (3/4 - 1/2) = 5/2
x . 1/4 = 5/2
x = 5/2 : 1/4
x = 10