![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](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)
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)
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)
\(\dfrac{-x-27}{27}=\dfrac{2}{3}\Rightarrow-x-27=18\Leftrightarrow x=-45\)
-> chọn B
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-\dfrac{x}{27}-1=\dfrac{2}{3}\)
\(\Rightarrow-\dfrac{x}{27}=\dfrac{2}{3}+1=\dfrac{5}{3}\)
\(\Rightarrow-3x=27.5\)
\(\Rightarrow x=-135:\left(-3\right)\)
\(\Rightarrow x=-45\)
`->B`
![](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)
a: 2x(x+1)-135=-200
=>2(x^2+x)=-65
=>2x^2+2x+65=0
=>x^2+x+32,5=0
=>x^2+x+0,25+32,25=0
=>(x+0,5)^2+32,25=0(vô lý)
b: 4x-5(x-1)+15=13
=>4x-5x+5=-2
=>5-x=-2
=>x=5+2=7
c: 2/3x-1/4=3/5-7/8
=>2/3x=3/5-7/8+1/4=24/40-35/40+10/40=-1/40
=>x=-1/40:2/3=-1/40*3/2=-3/80
d: 1/2(2x-3)+105/2=-137/2
=>1/2(2x-3)=-137/2-105/2=-242/2=-121
=>2x-3=-242
=>2x=-239
=>x=-239/2
![](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
`x-135:45=200`
`=>x-3=200`
`=>x=200+3=203`
2006 á