\(75\%x+\frac{3}{4}x+x=30\)

\(\Leftrightarrow\left(75\%+\frac{3}{4}+1\right)x=30\)

\(\Leftrightarrow\frac{5}{2}x=30\)

\(\Leftrightarrow x=30:\frac{5}{2}\)

\(\Leftrightarrow x=12\)

đổi 75%=3/4.Ta có:

3/4xX+3/4xX+X=30

(3/4+3/4+1)xX=30

    5/2     x    X=30

                 X  = 30:5/2

                X   = 12

\(75\%\times x+\frac{3}{4}\times x+x=30\)

\(\frac{3}{4}\times x+\frac{3}{4}\times x+1\times x=30\)

\(\left(\frac{3}{4}+\frac{3}{4}+1\right)\times x=30\)

\(\frac{5}{2}\times x=30\)

\(x=30\div\frac{5}{2}\)

\(x=12\)

giá xăng từ 20 000 đồng lên 21 000 đồng 1 lít . hỏi giá xăng tăng bao nhiêu phần trăm? 

0,75 x X + 0,75 x X + X = 30

X x ( 0,75 + 0,75 + 1 ) = 30

X x 2,5 = 30

X = 30 : 2,5

X = 12

75%xX+3/4xX+X=30

<=>3/4xX+3/4xX+X=30

<=>10/4xX=30

<=>10xX=120

<=>X=120/10=12

Vậy X=12

= 75% x X + 3/4 x X + X = 30

= X x (3/4 + 3/4 + 1) = 30

= X x 10/4 = 30

= X = 30 : 10/4

X = 12

=0,25 x X +0,75 x X +X x1=35

=X x (0,25 +0,75 +1)=35

=X x 2=35

 X = 35:2

 X = 17,5

chưa học tha cho em

1,308411215

4x - 15 = -75 - x

4x + x = -75 + 15

5x = -60

x = -60/5

x = -12

\(4\times x-15=-75-x\)

\(\Leftrightarrow4x-15+75=-x\)

\(\Leftrightarrow4x+60=-x\)

\(\Leftrightarrow60=-x-4x\)

\(\Leftrightarrow60=-5x\)

\(\Leftrightarrow x=-12\)

Vậy \(x=-12\)

Trả lời:

\(4x-15=-75-x\)

\(\Leftrightarrow4x+x=-75+15\)

\(\Leftrightarrow5x=-60\)

\(\Leftrightarrow x=-12\)

Vậy\(x=-12\)

Hok tốt!

Good girl

\(\dfrac{4\times x}{1\times5}\) + \(\dfrac{4\times x}{5\times9}\) + \(\dfrac{4\times x}{9\times13}\) + \(\dfrac{4\times x}{13\times17}\) = 16

\(x\times\left(\dfrac{4}{1\times5}+\dfrac{4}{5\times9}+\dfrac{4}{9\times13}+\dfrac{4}{13\times17}\right)\) = 16

\(x\) \(\times\) (\(\dfrac{1}{1}\) - \(\dfrac{1}{5}\) + \(\dfrac{1}{5}\) - \(\dfrac{1}{9}\) + \(\dfrac{1}{9}\) - \(\dfrac{1}{13}\) + \(\dfrac{1}{13}\) - \(\dfrac{1}{17}\)) = 16

\(x\) \(\times\) ( \(\dfrac{1}{1}\) - \(\dfrac{1}{17}\)) = 16

\(x\) \(\times\) \(\dfrac{16}{17}\)  = 16

\(x\)            = 16 : \(\dfrac{16}{17}\)

\(x\)             = 17