a) 120 - ( x + 14 ) = 45
x + 14 = 120 - 45
x + 14 = 75
x = 75 - 14
x = 61
b) 79 - x - 18 = 37
79 - x = 37 + 18
79 - x = 55
x = 79 - 55
x = 24
a)120-(x+14)=45
=>x+14=120-45
=>x+14=75
=>x=61
b) tự làm
a,120-(x+14)=45
x+14=120-45
x+14=75
x=75-14
x=61
Vậy...
b,79-x-18=37
79-x=37-18
79-x=19
x=79-19
x=60
Vậy...
a)120-(x+14)=45
=120-x-14=45
=120-14-x=45
=106-x=45
x=106-45
x=61
b)79-x-18=37
=79-18-x=37
=61-x=37
x=61-37
x=24
a , 120-(x+14)=45
x+14=120-45=75
x=75-14=61
b, 97-x-18=37
79-x=37
x=79-37=42
h cho minh nha moi nguoi !!!!!!!!!!!!!!!thankyou very much
