( x-2) .3 =18 135-3(x+1)=30
(x-2) =18:3 3(x+1)=135-30
(x-2) =6 3(x+1)=105
x =6+2 x+1 =105:3
x =8 x+1 =35
x =35-1
x =34
(123-x)-72=28 (158-x):7=28
(123-x) =28+72 (158-x) =28.7
(123-x) =100 (158-x) =784
x =123-100 x =158-784
x =23 x =-626
42.x=39.42-37.42
42.x=42.(39-37)
42.x=42.2
x=42.2:42
x =2
bài này dài lắm đó k mik nha
( x - 2 ) . 3 = 18 135 - 3( x + 1 ) = 30 ( 123 - x ) - 72 = 28
x - 2 = 18 : 3 3( x + 1 ) = 135 - 30 123 - x = 28 + 72
x - 2 = 6 3( x + 1 ) = 105 123 - x = 100
x = 6 + 2 x + 1 = 105 : 3 x = 123 - 100
x = 8 x + 1 = 35 x = 23
x = 35 - 1
x = 34
( 158 - x ) : 7 = 20 42 . x = 39 . 42 - 37 . 42
158 - x = 20 x 7 42 . x = 42 . ( 39 - 37 )
158 - x = 140 42 . x = 84
x = 158 - 140 x = 84 : 42
x = 18 x = 2
1,(x-2)x3=18
x-2=18:3
x-2=6
x=6+2
x=8
2,135-3(x+1)=30
132(x-1)=30
x-1=132:30
x-1=4,4
x=4,4+1
x=5,4
3,(123-x)-72=28
123-x=28+72
123-x=100
x=100+123
x=223
4,(158-x):7=20
158-x=20x7
158-x=140
x=140+158
x=298
5,42.x=39x42-37x42
42.x=42x(39-37)
42.x=42x2
42.x=84
x=84:42
x=2
bn ơi k cho mk nhé
bn hok tốt
( x-2) .3 =18 135-3(x+1)=30
(x-2) =18:3 3(x+1)=135-30
(x-2) =6 3(x+1)=105
x =6+2 x+1 =105:3
x =8 x+1 =35
x =35-1
x =34
(123-x)-72=28 (158-x):7=28
(123-x) =28+72 (158-x) =28.7
(123-x) =100 (158-x) =784
x =123-100 x =158-784
x =23 x =-626
42.x=39.42-37.42
42.x=42.(39-37)
42.x=42.2
x=42.2:42
x =2
bài này dài lắm đó k mik nha
