x + 60 = 90
x = 90 - 60
x = 30
x + 20 = 50
x = 50 - 20
x = 30
1 . x + 60 = 90
x = 90 - 60
x = 30
Vậy x = 30
2. x + 20 = 50
x = 50 - 20
x = 30
Vậy x = 30
x + 60 = 90
x = 90 - 60
x = 30
______________________
x + 20 = 50
x = 50 - 20
x = 30 ai k mk,mk k lại~~
x + 60 = 90
x = 90 - 60
x = 30
x + 20 = 50
x = 50 - 20
x = 30
x=30
x=30
k mik nha
trả lời nhì đó
a-ri-ga-to
x + 60 = 90
x = 90 - 60
x = 30
______________________
x + 20 = 50
x = 50 - 20
x = 30 ai k mk,mk k lại
x + 60 = 90 x + 20 = 50
x = 90 - 60 x = 50 - 20
x = 3 x = 3
x + 60 = 90
x = 90 - 60
x = 30
x + 20 = 50
x = 50 - 20
x = 30