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a. \(\frac{1}{3}x-\frac{2}{5}=\frac{2}{3}x+1\)
\(\Leftrightarrow\frac{1}{3}x-\frac{2}{3}x=1+\frac{2}{5}\)
\(\Leftrightarrow-\frac{1}{3}x=\frac{7}{5}\)
\(\Leftrightarrow x=\frac{7}{5}\div\frac{-1}{3}\)
\(\Leftrightarrow x=\frac{21}{-5}\)
b. \(\frac{-4}{5}x+\frac{1}{3}=\frac{2}{3}x+\frac{1}{2}\)
\(\Leftrightarrow\frac{1}{3}-\frac{1}{2}=\frac{2}{3}x+\frac{4}{5}x\)
\(\Leftrightarrow\frac{-1}{6}=\frac{22}{15}x\)
\(\Leftrightarrow x=\frac{-1}{6}\div\frac{22}{15}\)
\(\Leftrightarrow x=\frac{-15}{132}\)
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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
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nhìn cái đề con hơi bị ''sốc'' , thế này ạ ???
Sửa đề \(4+\frac{1}{3}x\left(\frac{1}{6}-\frac{1}{2}\right)\le x\le\frac{2}{3}x\left(\frac{1}{3}-\frac{1}{2}-\frac{3}{4}\right)\)
\(4+\frac{1}{3}x\left(-\frac{1}{3}\right)\le x\le\frac{2}{3}x\left(-\frac{11}{12}\right)\)
\(4-\frac{1}{9}x\le x\le-\frac{11}{18}x\)
![](https://rs.olm.vn/images/avt/0.png?1311)
mk giúp bạn câu cuối nhé:
3|x+2|-5=16
3|x+2|=16+5
3|X+2|=21
|x+2|=21:3
|x+2|=7
=>x+2=7 hoặc x+2=-7
+) với x+2=7 +) với x+2= -7
x=5. x=-9
vậy x€{5,-9}
nếu có TGian mk sẽ giải cho bạn mấy câu trên
cam ơn bạn nhé bạn có giup mình not câu trên trong vong ngay ko
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\(1,\left(\left(3\cdot\left(3x+2\right)\right)+4\cdot\left(x+2\right)\right)-90=0.\)
\(13x-76=0\)
\(13x=76\)
\(x=\frac{76}{13}\)
\(2,\left(\left(5\cdot\left(x+1\right)\right)+3\cdot\left(2x+1\right)\right)-65=0\)
\(11x-57=0\)
\(11x=57\)
\(x=\frac{57}{11}\)
\(3,\left(\left(3\cdot\left(3x+4\right)\right)+5\cdot\left(2x+1\right)\right)-100=0\)
\(19x-83=0\)
\(19x=83\)
\(x=\frac{83}{19}\)
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1, 4[3x + 4] = 12x + 16
2, 4/3[5/3x + 6] = 20/9x + 12
3, [4/3x + 7]. 5 + 2 = 20/3x + 35 + 2 = 20/3x + 37
4, [3/7x - 6][-7] + 3x = -3x + 42 + 3x = 42
-3x+1/2=2-3/4
= -3x+1/2 = 5/4
= -3 x = 5/4 - 1/2
= -3 x = 3/4
= x = 3/4 : -3
= x = -1/4
`-3x+1/2 = 2-3/4`
`-3x+1/2 = 8/4 - 3/4`
`-3x +1/2 =5/4`
`-3x=5/4 - 1/2`
`-3x=5/4 - 2/4`
`-3x = 3/4`
`x=3/4:(-3)`
`x=3/4 xx (-1)/3`
`x=-1/4`
Vậy `x=-1/4`