\(x+x:0,5\times7,5+x:2\times9=315\)

\(x\times\left(1+1:0,5\times7,5\right)+x\times\left(1:2\times9\right)=3,15\)

\(x\times16+x\times4,5=315\)

\(x\times\left(16+4,5\right)=315\)

\(x\times20,5=315\)

\(x=315:20,5\)

\(x=15\)

a) \(\frac{2}{3}:\frac{2}{3}\times x=1\)

\(1\times x=1\)

x = 1

b) \(x+x:5\times7,5+x:2\times9=315\)

\(x+x\cdot\frac{1}{5}\cdot7,5+x\cdot\frac{1}{2}\cdot9=315\)

\(x\cdot\left(1+\frac{1}{5}.7,5+\frac{1}{2}.9\right)=315\)

x.7 = 315

x = 45

Dấu . là dấu nhân nha

Tìm x : 

a) 2/3 : 2/3 × X = 1 

1 × X = 1 

X = 1 : 1 

X = 1 

b) X + X : 5 × 7,5 + X : 2 × 9 = 315

X + X × 1/5 × 7,5 + X × 1/2 × 9 = 315 

X × 1 + X × 1,5 + X × 4,5 = 315 

X × ( 1 + 1,5 + 4,5 ) = 315 

X × 7 = 315 

X = 315 : 7

X = 45

VẬY X = 45

\(x+x\div5\times\frac{15}{2}+x\div2\times9\)

\(x+\frac{x}{5}\times\frac{15}{2}+\frac{x}{2}\times9=315\)

\(\Leftrightarrow x+\frac{3x}{2}+\frac{9x}{2}=315\)

\(\Leftrightarrow7x=315\Rightarrow x=45\)

 x+x:5*7,5+x:2 *9=315

x*1+x*1,5+x*4,5=315

x*[1 +2,5+4,5]=315

x*7=315

x =315:7

x=45

x + x:5x7,5 + x : 2x9 = 315

x + x:37,5 + x   :18   = 315

x + (37,5 + 18 )        = 315

x +  55,5                 = 315

          x                  = 315 - 55,5

          x                  = 259,5

jaki natsumi

x+x:5x7,5+x:2x9 = 315

x+x:37,5  +x:18   = 315

x : ( 37,5 +18 +1) = 315

x :56,5                = 315

x                        = 315 x 56,5 

x                        = 17 797,5

Giải 
X + X : 5 x 7,5 + X : 2 x 9 = 315 
X + 7,5 X / 5 + 9 X / 2 = 315 
X + 1,5 X + 4,5 X = 315 
7X = 315 
X = 315 : 7 
X = 45

Xx1+Xx1:5x7,5+Xx1:2x9=315

Xx1+Xx0,2x7,5+Xx0,5x9=315

Xx1+Xx1,5+Xx4,5=315

Xx(1+1,5+4,5)=315

Xx7=315

X=315:7

X=45

\(x+x:5\cdot7,5+x:2\cdot9=315\)

\(x+x:\left(5:7,5\right)+x:\left(2:9\right)=315\)

\(x+x:\frac{10}{15}+x:\frac{2}{9}=315\)

\(x+x\cdot\frac{3}{2}+x.\frac{9}{2}=315\)

\(x\left(1+\frac{3}{2}+\frac{9}{2}\right)=315\)

\(x\left(\frac{2}{2}+\frac{3}{2}+\frac{9}{2}\right)=315\)

\(7x=315\)

\(x=315:7\)

\(x=45\)
 

a, \(x\) - \(\dfrac{2}{7}\) = \(\dfrac{4}{5}\) \(\times\) \(\dfrac{15}{24}\)

    \(x\) - \(\dfrac{2}{7}\) = \(\dfrac{1}{2}\)

    \(x\)        = \(\dfrac{1}{2}\) + \(\dfrac{2}{7}\)

    \(x\)       = \(\dfrac{11}{14}\)

b, \(x\): \(\dfrac{2}{7}\) = \(\dfrac{9}{8}\) - \(\dfrac{15}{6}\)

     \(x\):  \(\dfrac{2}{7}\) = - \(\dfrac{11}{8}\)

     \(x\)      = - \(\dfrac{11}{8}\) \(\times\) \(\dfrac{2}{7}\)

     \(x\)     = - \(\dfrac{11}{28}\)

a) x = 11/14

b) x = -11/28

\(a,\) \(x\) \(-\) \(\dfrac{2}{7}\) \(=\dfrac{4}{5}\times\dfrac{15}{24}\)

   \(x-\dfrac{2}{7}=\dfrac{1}{2}\)

  \(x\)          \(=\) \(\dfrac{1}{2}+\dfrac{2}{7}\)

 \(x\)           \(=\) \(\dfrac{11}{14}\)

\(b,\) \(x\div\dfrac{2}{7}=\dfrac{9}{8}-\dfrac{15}{6}\)                                               

\(x\div\dfrac{2}{7}=\dfrac{87}{24}\)

\(x=\dfrac{87}{24}\times\dfrac{2}{7}\)

\(x=\dfrac{87}{84}\)

mk nghĩ là 1122748938

Máy tính đâu lấy ra mà tính

  x:1/12 - x:5x7,5 + x:2x9 = 3105

=> x:1/12 - x:2/3 + x:2/9 = 3105

=> Xx12 - Xx3/2 + Xx9/2 = 3105

=>      X x (12-3/2+9/2 )   =3105

=>      X x 15                  =3105

                                 X   = 3105 : 15

                                  X   = 207

mk giống bạn truong nhat linh bằng 207 nha bạn Nguyễn Thành NAm