4/5 X0,5+5/12 X0,3+8:10X 0,2
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NK
3
3 tháng 3 2017
X - (4,5 + 2,3) = 6,9
X - 6,8 = 6,9
X = 6,9 + 6,8
X = 13,7
\(\frac{5}{8}:x=\frac{1}{2}-\frac{1}{4}\)
\(\frac{5}{8}:x=\frac{1}{4}\)
\(x=\frac{5}{8}:\frac{1}{4}\)
\(x=\frac{5}{2}\)
\(\frac{1}{9}:\left(x-1\right)=\frac{1}{4}\)
\(\frac{1}{9}:x-\frac{1}{9}:1=\frac{1}{4}\)
\(\frac{1}{9}:x-\frac{1}{9}=\frac{1}{4}\)
\(\frac{1}{9}:x=\frac{1}{4}+\frac{1}{9}\)
\(\frac{1}{9}:x=\frac{13}{36}\)
\(x=\frac{13}{36}:\frac{1}{9}\)
\(x=\frac{13}{4}\)
X x 2 + X x 0,3 = 0,69
X x (2 + 0,3) = 0,69
X x 2,3 = 0,69
X = 0,69 : 2,3
X = 0,3
3 tháng 3 2017
a) x - ( 4,5 + 2,3 )= 6,9
x - 6,8 = 6,9
x = 6,9 - 6,8
x = 0,1
b)\(\frac{5}{8}\): x = \(\frac{1}{2}-\frac{1}{4}\)
\(\frac{5}{8}-x=\frac{1}{4}\)
x = \(\frac{5}{8}-\frac{1}{4}\)
x = \(\frac{3}{8}\)
c) \(\frac{1}{9}:\left(x-1\right)=\frac{1}{4}\)
x - 1 = \(\frac{1}{9}:\frac{1}{4}\)
x - 1 = \(\frac{4}{9}\)
x = \(\frac{4}{9}+1\)
x = \(\frac{13}{9}\)
d) X x 2 + X x 0,3 = 0,69
X x ( 2 + 0,3 ) = 0,69
X x 2,3 = 0,69
X = 0,69 : 2,3
X = 0,3
TG
1
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
TQ
1
22 tháng 2 2018
X.(5X-4)-5(X^2+8)+10X=12
x5x-x4-5X^2-5.8+10X=12
X.(5X-4-5X)-40+10X=12
X.4-10.4+10X=12
4.X+10X-40=12
X.(4+10)=12+40
X.14=52
X=52:14
X=52PHAN14
NT
1
10 tháng 1 2017
1/ 3(x - 4) - (8 - x) = 12 => 3x - 12 - 8 + x = 12 => 4x = 32 => x = 8
2/ 4(x - 5) - 3(x - 7) = -9 => 4x - 20 - 3x + 21 = -9 => x = -10
3/ 7(x - 3) -5(3 - x) = 11x - 5 => 7x - 21 - 15 + 5x = 11x - 5 => x = 31
4/ -5(2 - x) + 4(x - 3) = 10x => -10 + 5x + 4x - 12 = 10x => x = -22
D
10 tháng 1 2017
1) 3.(x-4)-(8-x) = 12
=> 3x-12-8+x = 12
=> 4x - 20 = 12
=> 4x = 12 +20 = 32
=> x = 32: 4 = 8
2) 4.(x-5)-3(x-7) = -9
=> 4x-20-3x+21 = -9
=>x +1 = -9
=>x = -9-1= -10
3) 7.(x-3)-5(3-x) = 11x-5
=> 7x-21-15+5x = 11x -5
=> 12x - 36 = 11x -5
=> 12x-11x = -5+36
hay x = 31
4) -5.(2-x)+4.(x-3) = 10x
=> -10+5x+4x-12 = 10x
=> -22 + 9x = 10x
=> -22 = 10x -9x
hay x = -22
XONG 
26 tháng 6 2023
`@` `\text {Ans}`
`\downarrow`
`a.`
\(0,3-\dfrac{4}{9}\div\dfrac{4}{3}\cdot\dfrac{6}{5}+1\)
`=`\(0,3-\dfrac{1}{3}\cdot\dfrac{6}{5}+1\)
`=`\(0,3-0,4+1\)
`= -0,1 + 1`
`= 0,9`
`b.`
\(1+2\div\left(\dfrac{2}{3}-\dfrac{1}{6}\right)\cdot\left(-2,25\right)\)
`=`\(1+2\div\dfrac{1}{2}\cdot\left(-2,25\right)\)
`=`\(1+4\cdot\left(-2,25\right)\)
`= 1+ (-9) = -8`
`c.`
\(\left[\left(\dfrac{1}{4}-0,5\right)\cdot2+\dfrac{8}{3}\right]\div2\)
`=`\(\left(-\dfrac{1}{4}\cdot2+\dfrac{8}{3}\right)\div2\)
`=`\(\left(-\dfrac{1}{2}+\dfrac{8}{3}\right)\div2\)
`=`\(\dfrac{13}{6}\div2\)
`=`\(\dfrac{13}{12}\)
`d.`
\(\left[\left(\dfrac{3}{8}-\dfrac{5}{12}\right)\cdot6+\dfrac{1}{3}\right]\cdot4\)
`=`\(\left(-\dfrac{1}{24}\cdot6+\dfrac{1}{3}\right)\cdot4\)
`=`\(\left(-\dfrac{1}{4}+\dfrac{1}{3}\right)\cdot4\)
`=`\(\dfrac{1}{12}\cdot4=\dfrac{1}{3}\)
`e.`
\(\left(\dfrac{4}{5}-1\right)\div\dfrac{3}{5}-\dfrac{2}{3}\cdot0,5\)
`=`\(-\dfrac{1}{5}\div\dfrac{3}{5}-\dfrac{1}{3}\)
`=`\(-\dfrac{1}{3}-\dfrac{1}{3}=-\dfrac{2}{3}\)
`f.`
\(0,8\div\left\{0,2-7\left[\dfrac{1}{6}+\left(\dfrac{5}{21}-\dfrac{5}{14}\right)\right]\right\}\)
`=`\(0,8\div\left[0,2-7\left(\dfrac{1}{6}-\dfrac{5}{42}\right)\right]\)
`=`\(0,8\div\left(0,2-7\cdot\dfrac{1}{21}\right)\)
`=`\(0,8\div\left(0,2-\dfrac{1}{3}\right)\)
`= 0,8 \div (-2/15)`
`=-6`
`@` `yHGiangg.`