a: =>x-9/2=37/40
=>x=37/40+9/2=217/40
b: x-9/2=15
=>x=15+9/2=30/2+9/2=39/2
c: 2/3=12/x
=>x=12x3:2=18
a. x - 9/2 = 1/8 + 4/5
x - 9/2 = 37/40
x = 37/40 + 9/2
x = .............
b. x - 9/2 = 15
x = 15 + 9/2
x = .........
c. 2/3 = 12/18
- Mấy chỗ mình chấm bn tự tính nha