a) 125 : x + ( 32 + 15 ) = 72
125 : x + 47 = 72
125 : x = 72 - 47
125 : x = 25
x = 125 : 25
x = 5
b) ( 35 + 135 ) - 2 . x = 86
170 - 2 . x = 86
2 . x = 170 - 86
2 . x = 84
x = 84 : 2
x = 42
c) 7 . x - 5 = 65
7 . x = 65 + 5
7 . x = 70
x = 70 : 7
x = 10
A) 125 / x + (32 + 15) = 72
125 / x + 47 = 72
125 / x = 72 - 47
125 / x = 25
x = 125 / 25
x = 5
B)
(35 + 135) - 2 x x = 86
170 - 2 x x = 86
2 x x = 170-86
2 x x = 84
x = 84/2
x = 42
7 x x - 5 = 65
7 x x = 65 -5
7 x x = 60
x = 60/7
x = 8.571428571
a) 125 : x + (32+15) = 72 b) (35+135)-2x=86 c) 7x - 5 =65 d) 125 -3(2x-5)=50 e) 7x+23x+30 =50
125:x + 47 =72 170 - 2x = 86 7x=65+5 3(2x-5) =125-50 x(7+23)+30 =50
125 : x =25 2x = 170-86 7x=70 3(2x-5) =75 x. 30 =20
x = 125:25 2x=104 x=10 2x-5=75:3 x = \(\frac{2}{3}\)
x= 5 x=52 2x-5=25
2x=30
x=15
D)
125 - 3 x (2 x x -5) = 50
3 x (2 x x -5) = 125 -50
3 x (2 x x -5) = 75
2 x x -5 = 75/3
2 x x -5 = 25
2 x x = 25 +5
2 x x = 30
x = 30/2
x = 15
E)
7 x x + 23 x x + 30 = 50
7 x x + 23 x x = 50 - 30
7 x x + 23 x x = 20
(7 + 23) x x = 20
30 x x = 20
x = 20 / 30
x = 2 phần 3
k cho tui nha
a) 125 : x + ( 32+15 ) =72 b) ( 35+135) - 2 x x = 86 c) 7 x x - 5 = 65
125 : x + 47 =72 170 - 2 x x = 86 7 x x = 65 + 5
125 : x =72 -47 2 x x = 170 - 86 7 x x = 70
125 : x = 25 2 x x = 84 x = 70 : 7
x =125 : 25 x = 84 : 2 x = 10
x = 5 x = 42
d) 125 - 3 x ( 2 x x - 5 ) = 50 e) 7 x x + 23 x x + 30 = 50
3 x ( 2 x x - 5 ) = 125 - 50 ( 7 + 23 ) x + 30 = 50
3 x ( 2 x x - 5 ) = 75 30 x x + 30 = 50
2 x x - 5 = 75 : 3 30 x x = 50 - 30
2 x x - 5 = 25 30 x x = 20
2 x x = 25 + 5 x = 20 : 30
2 x x = 30 x = 2/3
x = 30 : 2
x = 15