x - 2 = 555 - 155
x - 2 = 400
x= 400 +2
x= 402
555 - ( x - 2 ) = 155
x - 2 = 555 - 155
x - 2 = 400
x = 400 + 2
x = 402
Kluận:...
555 - ( x - 2 ) = 155
( x - 2 ) = 555 - 155
( x - 2 ) = 400
x = 400 + 2
x = 402
Vậy x = 402
555 - ( x-2)=155
(X-2)=155-555
x-2=400
x=400+2=402
555-( x - 2 ) = 155
( x - 2 ) = 555 - 155
( x - 2 ) = 400
x = 400 + 2
x = 402
555 - ( x - 2 ) = 155
x - 2 = 555-155
x - 2 = 400
x = 400+2
x = 402