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![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
a: =>x-45=-20
hay x=25
b: =>35+30-5x=-12+112
=>65-5x=100
=>5x=-35
hay x=-7
c: =>x-124=1000
hay x=1124
d: \(\Leftrightarrow46-\left(3x-2\right)^3=-18\)
\(\Leftrightarrow\left(3x-2\right)^3=64\)
=>3x-2=4
hay x=2
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
a: =>x-45=-20
hay x=25
b: =>35+30-5x=-12+112=100
=>65-5x=100
=>5x=-35
hay x=-7
c: =>x-124=1000
hay x=1124
d: \(\Leftrightarrow46-\left(3x-2\right)^3=-18\)
\(\Leftrightarrow\left(3x-2\right)^3=64\)
=>3x-2=4
hay x=2
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có 3x+45=150%x+135
3x+45=1,5x+135
3x-1,5x=135-45
1,5x=90
x=90:1,5
x=60
![](https://rs.olm.vn/images/avt/0.png?1311)
123 x 45 - 41 x 135=
=123 x 45 - 41 x 3 x 45
=123 x 45 - 123 x 45
=0
123 x 45 - 41 x 135
= 123 x 45 - 41 x 3 x 45
= 45 x ( 123 - 41 x 3)
= 45 x ( 123 - 123)
=0
![](https://rs.olm.vn/images/avt/0.png?1311)
7x + 135 : 45 = 52
7x + 3 = 52
7x = 52 - 3
7x = 49
7x = 72
Vậy x = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
271-[(-43)+271+(-13)] = 56
40.(45-135)-40.(45+65)=-8000
32x+41=35-(-70) => x=2
tìm x thuộc z,y thuộc z biết:(x-1)(xy-5)=5 Chịu
![](https://rs.olm.vn/images/avt/0.png?1311)
1)
-131-74+(-45)-(131)
=-131 - 74 - 45 - 131
=-381
2)
x-(-14)= -54
x + 14 = -54
x = -54 - 14
x =-68
135-(x-47)=23
x - 47 = 135 - 23
x - 47= 112
x= 112 + 47
x=159
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 5x = 201 - 6 = 195
x = 195 : 5 = 39
b, 135 - 2x = 87
2x = 135 - 87 = 48
x = 48 : 2 = 24
c, 45 - ( x - 17 ) : 3 = 38
( x - 17 ) : 3 = 45 - 38 =7
x - 17 = 7 . 3 = 21
x = 21 + 17 = 38
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{-x-27}{27}=\dfrac{2}{3}\Rightarrow-x-27=18\Leftrightarrow x=-45\)
-> chọn B
![](https://rs.olm.vn/images/avt/0.png?1311)
=135.(-34)-135.86+35.75-(-45)
=135[(-34)-86]+35[75-(-45)]
=135(-120)+35.120
=-135.120+35.120
=120(-135+35)
=120.(-100)
=-12000
nói mk đi nha
`x-135:45=200`
`=>x-3=200`
`=>x=200+3=203`
2006 á