X- 13,64=43,61
X = 43,61 + 13,64
X = 57,25
X - 13,64 = 43,79
X = 43,79 + 13,64
X = 57,43
x - 13,64 = 43,2 + 0,59
x - 13,64 = 43,79
x = 43,79 + 13,64
x = 57,43.
Vậy x = 57,43
x - 13, 64 = 43, 2 + 0, 59
x - 13, 64 = 43, 79
x = 43, 79 + 13, 64
x = 57, 43
Học tốt !