7+x/12=2/3

    x/12=7-2/3

    x/12=19/3

19/3=76/12

=>x=76   

25-x/18=1/2

     x/18=25-1/2

     x/18=49/2

49/2=441/18

=>x=441

7+x/12=2/3

    x/12=7-2/3

    x/12=19/3

19/3=76/12

=>x=76   

25-x/18=1/2

     x/18=25-1/2

     x/18=49/2

49/2=441/18

=>x=441

dễ thương quá minion 

d, X/8*32+X/3*18-X/5*10=120

   X*32/8+X*18/3-X*10/5=120

  32X/8+18X/3-10X/5=120

  4X+6X-2X=120

  8X=120

 X=120/8

X=15

a, ( 25 * 12 - X - 25 ) : 25 = 4

( 25 * 12 - x - 25 )           = 4 * 25 

( 25 * 12 - x - 25 )           = 100

300 - x - 25                    = 100

300 - x                           = 100 + 25

300 - x                           = 125

x                                   = 300 - 125

x                                   = 175

Ta có (7+x)/12=2/3

  suy ra 3(7+x)=24

  suy ra 7+x=8

          x=1

Ta có (25-x)/18=1/2

suy ra 2(25-x)=18

suy ra 25-x=9

         x=16

a,x=-76

b,x=441

a) 25-(30+x)=x-(27-8)

25-(30+x)=x-19

????

Số âm à 25-30+x được 

thoi khong can giai nua dau minh da tim ra cau tra loi 

ma ket qua cua bai cau vua lam la sai day

Lô cưng

Cho anh hôn một cái nèo😘😘😘

Bài làm

Ta có: 3/x = 21/35y = y/25 = -18/z = 1/15

=> z = -18 . 15 : 1 = -270 

=> y = 25 . ( -18 ) : z = 25 . ( -18 ) : ( -270 ) = 5/3

=> x = 3 . 35y : 21 = 3 . 35 . 5/3 : 21 = 25/3

Vậy x = 25/3, y = 5/3, z = -270

\(\frac{3}{x}=\frac{21}{35y}=\frac{y}{25}=-\frac{18}{z}=\frac{1}{15}\)

Xét : \(\frac{3}{x}=\frac{1}{15}\Leftrightarrow45=x\Leftrightarrow x=45\)

Xét : \(\frac{y}{25}=\frac{1}{15}\Leftrightarrow15y=25\Leftrightarrow y=\frac{5}{3}\)

Xét : \(-\frac{18}{z}=\frac{1}{15}\Leftrightarrow-270=x\Leftrightarrow x=-270\)

bằng 0,82

a) (2x.6) .(3x-18) = 0

=> 2x.6 = 0 => 12x = 0 => x = 0

3x - 18 = 0 => 3x = 18 => x = 6

KL:...

b) 25 + (15-x) = 30

25 + 15 - x = 30

40 - x = 30

x = 10

\(a)\left(2x.6\right).\left(3x-18\right)=0\Leftrightarrow\hept{\begin{cases}2x.6=0\\3x-18=0\end{cases}\Leftrightarrow\hept{\begin{cases}12x=0\\3x=18\end{cases}\Leftrightarrow}\hept{\begin{cases}x=0\\x=6\end{cases}}}\)

\(b)25+\left(15-x\right)=30\Leftrightarrow15-x=5\Leftrightarrow x=20\)

tym cho mk nha

\(\left(2x.6\right)\left(3x-18\right)=0\)

<=> \(12x.\left(3x-18\right)=0\)

<=> \(\hept{\begin{cases}12x=0\\3x-8=0\end{cases}}\)

<=> \(\hept{\begin{cases}x=0\\x=6\end{cases}}\)

\(25+\left(15-x\right)=30\)

<=> \(25+15-x=30\)

<=> \(x=0\)

học tốt

\(\frac{25-x}{18}=\frac{1}{2}\)

\(\frac{25-x}{18}=\frac{9}{18}\)

\(25-x=9\)

\(x=25-9\)

\(x=16\)

\(\frac{25-x}{18}=\frac{1}{2}\)

\(\frac{25-x}{18}=\frac{9}{18}\)

\(\Rightarrow25-x=9\)

\(x=25-9\)

\(x=16\)

\(\frac{9}{22}\times\frac{33}{18}=\frac{9\times3\times11}{2\times11\times9\times2}\)\(=\frac{3}{4}\)

\(\frac{12}{35}:\frac{36}{25}=\frac{12}{35}\times\frac{25}{36}\)\(=\frac{12\times5\times5}{5\times7\times12\times3}=\)\(\frac{5}{21}\)

\(\frac{10}{17}:\frac{76}{51}=\frac{10}{17}\times\frac{51}{76}\)\(=\frac{10\times3\times17}{17\times76}\)\(=\frac{30}{76}=\frac{15}{38}\)

a,\(\frac{3}{4}\)

b,\(\frac{5}{21}\)

c,\(\frac{15}{38}\)

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