- 5x+ 5x+2 = 650
- 3x-1+ 5 . 3x-1 =162
- 23x+2 = 4x+5
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PT
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Những câu hỏi liên quan
TN
1
16 tháng 7 2016
b) \(x^3-5x^2+4x-20=0\)
\(=\left(x^3-5x^2\right)+\left(4x-20\right)=0\)
\(=x^2\left(x-5\right)+4\left(x-5\right)=0\)
\(=\left(x^2+4\right)\left(x-5\right)=0\)
\(x^2\ge0\)
\(\Rightarrow x^2+4\ge4>0\)
\(\Rightarrow x-5=0\)
\(\Rightarrow x=5\)
TN
0
12 tháng 3 2022
a, \(-4x+5+2x-1=3\Leftrightarrow-2x=-1\Leftrightarrow x=\dfrac{1}{2}\)
b, \(-2x+2=2\Leftrightarrow x=0\)
c, \(-2x-6=-8\Leftrightarrow x=1\)
DH
4 tháng 7 2017
a, \(4\left(18-5x\right)-12\left(3x-7\right)=15\left(2x-16\right)-6\left(x+14\right)\)
\(\Rightarrow72-20x-36x+84=30x-240-6x-84\)
\(\Rightarrow-20x-36x-30x+6x=-240-84-72-84\)
\(\Rightarrow-80x=-480\Rightarrow x=6\)
b, \(5\left(3x+5\right)-4\left(2x-3\right)=5x+3\left(2x+12\right)+1\)
\(\Rightarrow15x+25-8x+12=5x+6x+36+1\)
\(\Rightarrow15x-8x-5x-6x=36+1-25-12\)
\(\Rightarrow-4x=0\Rightarrow x=0\)
c, \(2\left(5x-8\right)-3\left(4x-5\right)=4\left(3x-4\right)+11\)
\(\Rightarrow10x-16-12x+15=12x-16+11\)
\(\Rightarrow10x-12x-12x=-16+11+16-15\)
\(\Rightarrow-14x=-4\Rightarrow x=\dfrac{2}{7}\)
d, \(5x-3\left\{4x-2\left[4x-3\left(5x-2\right)\right]\right\}=182\)
\(\Rightarrow5x-3\left[4x-2\left(4x-15x+6\right)\right]=182\)
\(\Rightarrow5x-3\left(4x-8x+30x-12\right)=182\)
\(\Rightarrow5x-12x+24x-90x+36=182\)
\(\Rightarrow-73x=182-36\)
\(\Rightarrow-73x=146\Rightarrow x=-2\)
Chúc bạn học tốt!!!
23 tháng 9 2021
d: \(\dfrac{x^4-2x^3+2x-1}{x^2-1}\)
\(=\dfrac{\left(x^2-1\right)\left(x^2+1\right)-2x\left(x^2-1\right)}{x^2-1}\)
\(=x^2-2x+1\)
\(=\left(x-1\right)^2\)
2 tháng 1 2023
2: 12-10x=25-30x
=>20x=13
=>x=13/20
3: \(3\left(2x+3\right)-2\left(4x-5\right)=10x+21\)
=>6x+9-8x+10=10x+21
=>10x+21=-2x+19
=>12x=-2
=>x=-1/6
4: \(\Leftrightarrow25x-15-6x+12=11-5x\)
=>19x-3=11-5x
=>24x=14
=>x=7/12
5: \(\Leftrightarrow8-12x-5+10x=4-6x\)
=>4-6x=-2x+3
=>-4x=-1
=>x=1/4
6: \(\Leftrightarrow32x-24-6+9x=13-40x\)
=>41x-30=13-40x
=>81x=43
=>x=43/81
7: \(\Leftrightarrow10x-5+20x=5x-11\)
=>30x-5=5x-11
=>25x=-6
=>x=-6/25
1) 5x+5x+2=650
5x.1+5x.52=650
5x(1+52)=650
5x(1+25)=650
5x.26=650
5x=650:26=25=52
=> x=2
2) 3x-1+5.3x-1=162
3x-1.1+5.3x-1=162
3x-1(1+5)=162
3x-1.6=162
3x-1=162:6=27=33
=> x-1=3
x=3+1=4
3) 23x+2=4x+5
23x.22=4x.45
23x+2=(2.2)x.(2.2)5=2x.2x.25.25=22x.25+5=22x.210=22x+10
=> 3x+2=2x+10
3x+2-2x=10
3x-2x=10-2=8
x=8
Tick nha
CHTT nha bạn !