https://hoc24.vn/cau-hoi/a-5x-2x-62-50b-5x-x-150-2-3c-6x-x-511-59-31d-5x-3x-36-334-124x-2x-68-219-216.2785429565572

a: \(\Leftrightarrow7x=35\)

hay x=5

b: \(\Leftrightarrow6x=78\)

hay x=13

a: \(\Leftrightarrow6x=30\)

hay x=5

b: \(\Leftrightarrow6x=25+12-1=36\)

hay x=6

A x=5

B x = 6 (36)

a: \(\Leftrightarrow8x=108+12=120\)

hay x=15

b: \(\Leftrightarrow6x=60\)

hay x=10

a) 5x + 3x = 120
    x . (5+3)= 120
    x . 8       = 120
    x            = 120 : 8
    x            = 15

c) 7x - 2x = 40
    x .(7-2)= 40
    x . 5     = 40

    x          = 40 : 5
    x          = 8

\(\left(x-36\right):18=12\)

\(x-36=12.18\)

\(x-36=216\)

\(x=252\)

vậy \(x=252\)

\(5x-3=3x-11\)

\(5x-3x=-11+3\)

\(2x=-8\)

\(x=-4\)

vậy \(x=-4\)

\(3x+5x=16\)

\(8x=16\)

\(x=2\)

vậy \(x=2\)

\(2\left(x+1\right)=10\)

\(x+1=5\)

\(x=4\)

vậy \(x=4\)

k nha Pham Tuyet Nhung

1.=> x-36 = 216   = > x = 216 +36 =252

2. =>2x = -8 = > x= -4

3.8 x = 16  = > x = 2

4 . => x= 10 -1 = 9

ok có j ko hiểu hỏi riêng nha

( x - 36 ) : 18 = 12

x - 36 = 12 . 18

x - 36 = 216

x = 216 + 36

x = 252

5x - 3 = 3x - 11

5x - 3x = -11 + 3

2x = -8

x = -8 : 2

x = -4

3x + 5x = 16 

8x = 16

x = 16 : 8

x = 2

2 ( x + 1 ) = 10

x + 1 = 10: 2

x + 1 = 5

x = 5-1 

x = 4

\(\left(x+15\right):3=7\)

\(x+15=7.3\)

\(x+15=21\)

\(x=21-15\)

\(x=6\)

----------------------------------

\(4.\left(6-x\right)=280:36\)

\(4.\left(6-x\right)=\dfrac{70}{9}\)

\(6-x=\dfrac{70}{9}:4\)

\(6-x=\dfrac{35}{18}\)

\(x=6-\dfrac{35}{18}\)

\(x=\dfrac{73}{18}\)

----------------------------------

\(5x-3x-12=8\)

\(2x=8+12\)

\(2x=20\)

\(x=\dfrac{20}{2}\)

\(x=10\)

\(\left(x+15\right):3=7\\ \Rightarrow x+15=7.3=21\\ \Rightarrow x=21-15=6\)

\(4\left(6-x\right)=280:36\\ \Rightarrow4\left(6-x\right)=\dfrac{70}{9}\\ \Rightarrow6-x=\dfrac{70}{9}:4\\ \Rightarrow6-x=\dfrac{35}{18}\\ \Rightarrow x=6-\dfrac{35}{18}=\dfrac{73}{18}\)

\(5x-3x-12=8\\ \Rightarrow2x=8+12=20\\ \Rightarrow x=\dfrac{20}{2}=10\)

x = 6

x = 73/18

x = 10

Bạn tìm Mẫu Thức Chung

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Kết Luận

\(\frac{x+3}{12}+\frac{2x+46}{16}=\frac{3x+9}{36}+\frac{5x+81}{6}\Leftrightarrow\frac{2\left(x+3\right)}{24}+\frac{\frac{3}{2}\left(2x+46\right)}{\frac{3}{2}.16}=\frac{\frac{2}{3}\left(3x+9\right)}{\frac{2}{3}.36}+\frac{4\left(5x+81\right)}{4.6}\)

\(\Leftrightarrow\frac{2\left(x+3\right)}{24}+\frac{3x+69}{24}=\frac{2x+6}{24}+\frac{20x+324}{24}\)\(\Leftrightarrow2x+6+3x+69=2x+6+20x+324\Leftrightarrow17x=-255\Leftrightarrow x=-\frac{255}{17}\)Vậy \(x=-\frac{255}{17}\)

\(3x+12=36\)

\(\Leftrightarrow3x=36-12\)

\(\Leftrightarrow3x=24\)

\(\Leftrightarrow x=24\div3\)

\(\Leftrightarrow x=8\)

\(4x+28=134\)

\(\Leftrightarrow4x=134-28\)

\(\Leftrightarrow4x=106\)

\(\Leftrightarrow x=106\div4\)

\(\Leftrightarrow x=\frac{53}{2}\)

\(5x-22=-17\)

\(\Leftrightarrow5x=22-17\)

\(\Leftrightarrow5x=5\)

\(\Leftrightarrow x=5\div5\)

\(\Leftrightarrow x=1\)

3x + 12 = 36 

3x = 36 - 12

3x = 24

x = 8

4x + 28 = 134

4x = 134 - 28

4x = 106

x = 106 : 4

x = 26 , 5

5x - 22 = -17

5x = -17 + 22

5x = 5

x = 1

3x - 184 = -49

3x = -49 + 184

3x = 135

x = 135 : 3  = 45

4x + 12 = 56

4x = 56 - 12

4x = 44

x = 11

3x - 127 = - 22

3x = -22 + 127 

3x = 105

x = 105 : 3 = 35

3x + 22 = 124

3x = 124 - 22 = 102

x = 102 : 3

x = 34

4x - 9 = 31

4x = 31 + 9 = 40

x = 40 : 4= 10

5x - 211 = -31 

5x = -31 + 211

5x = 180

x = 180 : 5

x  = 36

2) 3x + 12 = 36

    3x         =36-12

    3x         =24

     x          =24 :3

      x          =8

ngu

\(\frac{7}{9}+\frac{5}{12}-\frac{3}{4}\)

\(=\frac{7x4}{36}+\frac{5x3}{36}-\frac{3x9}{36}\)

\(=\frac{28+15-27}{36}\)

\(=\frac{16}{36}=\frac{4}{9}\)