=> X x 10 + 17 = 50
=> X x 10 = 33
=> X = 3,3
x = 22 + 5 = 27
x = 50 - 27 = 23
x = 23 : 10
x = 2,3 nha
X x 10 - 5 +22 = 50
X x 10 - 5 = 55 - 22
X x 10 - 5 = 33
X x 10 = 33 + 5
X x 10 = 38
x = 38 : 10
x = 3,8
X x 10 - 5 +22 = 50
x*10-27=50
x*10=23
x=2,3
x . 10 - 5 + 22 = 50
x . 10 - 5 = 50 - 22 = 28
x . 10 = 28 + 5 = 33
x = 33 : 10 = 3,3