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

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

0,3 nhé 100 %

=>x(0,2+0,5+0,25+1)=45

=>x*1,95=45

=>x=300/13

1)6x-8=3x+1

6x-3x=1+8

3x=9

x=3

Vậy x=3

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

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

hgghjhhhhfghhgffhhhfgfyyj

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

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

`@` `\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.`

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