a) x + 34 = 123
x = 123-34
x = 89
Vậy, x= 89
b) 5x - 70 = 15
5x = 15+ 70
5x = 85
x = 85 : 5
x = 17
Vậy, x = 17
a) x+34=123
x=123-34
x=89
vậy x=89
b) 5x-70=15
5x=15+70
5x=85
x=85/5
x=17
vậy x=17
a)x+34=123 b)5x-70=15
x=123-34 5x=15+70
x=89 5x=85
vậy x=89 x=85:5
x=17
vậy x=17
x+34=123
x=123-34
x= ...
a) x + 34 = 123
x = 123 - 34
x = 89
b) 5x - 70 = 15
5x = 15 + 70
5x = 85
x = 85 : 5
x = 17
a) x+34=123 b)5x-70=15
x=123-34 5x=15+70
x=89 5x=85
x=85:5
x=17