Theo đề bài :
72x + 72x+2 = 2450
=> 72x . (1 + 72) = 2450
=> 72x . (1 + 49) = 2450
=> 72x . 50 = 2450
=> 72x = 49
=> 2x = 2
=> x = 1
Cho mình !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
72x+72x+2=2450
72x x (1+72)=2450
72x x 50 =2450
72x=2450:50
72x=49=72
suy ra 2x=2
suy ra x=1
Ta có: 72X + 72X+2 =2450
=> 72X .1+ 72X . 72 =2450
=> 72x .( 1+72 ) =2450
=> 72X . 50 =2450
=> 72X =2450/50
=> 72X =49
=> 72X =72
=> 2x =2
=> x =1