x + 20 - 10 = 110
x + 20 = 110 + 10
x + 20 = 120
x = 120 - 20
x = 100
x + 80 - 50 = 100
x + 80 = 100 + 50
x + 80 = 150
x = 150 - 80
x = 70
x+ 20= 110+10
x+20= 120
x= 120-20
x= 100
x+80= 100+50
x+80= 150
x= 150-80
x=70
k nhé
tìm x :
x + 20 - 10 = 110
x + 20 = 110 + 20
x + 20 = 120
x = 120 - 20
x = 100
x + 80 - 50 = 100
x + 80 = 100 + 50
x + 80 = 150
x = 150 - 80
x = 70
a. x= 110 + 10 - 20
x= 120
b. x= 100+ 50 - 80
x = 70
k cho mình nha bạn
