X x 0,1=2/5

X x 1/10=2/5

X = 2/5 : 1/10

X = 4

Vậy X = 4.

X x 0,1=2/5

X :10=2/5

X = 2/5 x10

X = 4

x = 4

X x 0,1 = 2/5

X = 4

X x 15 - X : 0,1 = 2

X x 15 - X x 10 = 2

X x (15 - 10) = 2

X x 5 = 2

X = 2/5

X x 15 - X : 0,1 = 2

X x 15 - X x 10 = 2

X x ( 15 - 10 ) = 2

X x 5 = 2

X = 2 : 5

X = 0,4

Vậy X = 0,4

Nhớ k cho mình nhé!

X x 15 - X : 0,1 = 2

X x 15 - X x 10 = 2

X x ( 15 - 10 )   = 2

X x 5               = 2

X                    = 2 : 5

X                    = \(\frac{2}{5}\)

K mình nha , mình nhanh nhất đó 

Kết bạn ko ?

a. 

  150 + x : 3 = 620 : 4 

   150 + x : 3 = 155

            x : 3 = 155 - 150

            x : 3 = 5 

            x     = 5 x 3 

           x     = 15 

b.

   x * 0,1 = 1/2 -2/5

   x * 1/10 = 5/10 - 4/10 

   x * 1/10 = 1/10

  x            = 1/10 : 1/10 

  x            = 1 

c.

4/9 + 5/9 : x = 1 

        5/9 : x = 1 - 4/9

        5/9 :x  = 5/9

              x  = 5/9 : 5/9

              x  = 1 

1)  \(150+x.\frac{1}{3}=155\)

\(\frac{1}{3}x=5\)

\(x=15\)

2)  \(x.\frac{1}{10}=\frac{1}{2}-\frac{2}{5}\)

\(\frac{1}{10}x=\frac{5}{10}-\frac{4}{10}\)

\(\frac{1}{10}x=\frac{1}{10}\)

\(x=1\)

3)  \(\frac{4}{9}+\frac{9}{5}x=1\)

\(\frac{9}{5}x=\frac{9}{9}-\frac{4}{9}\)

\(\frac{9}{5}x=\frac{5}{9}\)

\(x=1\)

giải nhanh giúp mình nha<3 thanks

 5 *x phần x-3=6                                               0,1*x=1/2

=5x3                                                              =1/2:0,1

=15                                                                =5

=15+3

=18

0,1*x=1/2

      x=1/2:0,1

      x=5

a) PT \(\Leftrightarrow x=\dfrac{6}{0,12}=50\)

  Vậy \(x=50\)

b) PT \(\Leftrightarrow x=4\cdot2,5=10\)

  Vậy \(x=10\)

c) PT \(\Leftrightarrow x=\dfrac{5,6}{4}=1,4\)

  Vậy \(x=1,4\)

d) \(\Leftrightarrow x=\dfrac{\dfrac{2}{5}}{0,1}=4\)

  Vậy \(x=4\)

a) \(0,12\times x=6\)

\(x=\dfrac{6}{0,12}\)

\(x=50\).

a: \(\left(\sqrt{3}\right)^x=243\)

=>\(3^{\dfrac{1}{2}\cdot x}=3^5\)

=>\(\dfrac{1}{2}\cdot x=5\)

=>x=10

b: \(0,1^x=1000\)

=>\(\left(\dfrac{1}{10}\right)^x=1000\)

=>\(10^{-x}=10^3\)

=>-x=3

=>x=-3

c: \(\left(0,2\right)^{x+3}< \dfrac{1}{5}\)

=>\(\left(0,2\right)^{x+3}< 0,2\)

=>x+3>1

=>x>-2

d: \(\left(\dfrac{3}{5}\right)^{2x+1}>\left(\dfrac{5}{3}\right)^2\)

=>\(\left(\dfrac{3}{5}\right)^{2x+1}>\left(\dfrac{3}{5}\right)^{-2}\)

=>2x+1<-2

=>2x<-3

=>\(x< -\dfrac{3}{2}\)

e: \(5^{x-1}+5^{x+2}=3\)

=>\(5^x\cdot\dfrac{1}{5}+5^x\cdot25=3\)

=>\(5^x=\dfrac{3}{25,2}=\dfrac{1}{8,4}=\dfrac{10}{84}=\dfrac{5}{42}\)

=>\(x=log_5\left(\dfrac{5}{42}\right)=1-log_542\)