a , x + 258 = 895 - 120
x + 258 = 775
x = 517
b , 123 - x = 789
x = 123 - 789
x = - 666
a, x + 258 = 895 - 120
x + 258 = 775
x = 775 - 258
x = 517
b, 123 - x = 789
x = 123 - 789
x = - 666
x+258=895-120
x+258=775
x=775-258
x=517
a, x + 258 = 895 - 120
x + 258 = 775
x = 775 - 258
x = 517
123 - x = 789
x = 123 - 789
x = - 666
Trả lời:
a , x + 258 = 895 - 120
x + 258 = 775
x = 517
b , 123 - x = 789
x = 123 - 789
x = - 666