108:( 30-x )=90
30-x =108:90
30-x =1,2
x = 30-1,2
x =28,8
108 : ( 30 - x ) = 90
30 - x = 108 : 90
30 - x = 1,2
x = 30 - 1,2
x = 28,8
108 : (30 - x) = 90
30 - x = 108 : 90
30 - x = 1,2
x = 30 - 1,2
x = 28,8
Vậy x = 28,8
108 : (30 - x) = 90
30 - x = 108 : 90
30 - x = \(\frac{6}{5}\)
x = 30 - \(\frac{6}{5}\)
x = \(\frac{144}{5}\)
180 : (30-x) = 90
=> 30 -x = 180 : 90
=> 30 -x = 2
=> x = 30 - 2 = 28
=> x = 28
108:(30-x)=90
=>30-x=108:90
=>30-x=\(\frac{6}{5}\)
=>x=30-
108:(30-x)=90
30-x=108:90
30-x=1,2
x=30-1,2
x=28,8 hoac =144/5
180 : (30-x) = 90
=> 30 -x = 180 : 90
=> 30 -x = 2
=> x = 30 - 2 = 28
=> x = 28