c) \(5x-7=3x+9\)

d) \(5x-\left|9-7x\right|=3\)

e) \(-5+\left|3x-1\right|+6=\left|-4\right|\)

h) \(5^{-1}.25^x=125\)

\(\Rightarrow\frac{1}{5}.25^x=125\)

\(\Rightarrow25^x=125:\frac{1}{5}\)

\(\Rightarrow25^x=625\)

\(\Rightarrow25^x=25^2\)

\(\Rightarrow x=2\)

Vậy \(x=2.\)

Chúc bạn học tốt!

g) \(\left(x-1\right)^2=\left(x-1\right)^4\)

\(\Rightarrow\left(x-1\right)^2-\left(x-1\right)^4=0\)

\(\Rightarrow\left(x-1\right)^2.\left[1-\left(x-1\right)^2\right]=0\)

\(\Rightarrow\left[{}\begin{matrix}\left(x-1\right)^2=0\\1-\left(x-1\right)^2=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x-1=0\\\left(x-1\right)^2=1\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=0+1\\x-1=1\\x-1=-1\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=1\\x=1+1\\x=\left(-1\right)+1\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=1\\x=2\\x=0\end{matrix}\right.\)

Vậy \(x\in\left\{1;2;0\right\}.\)

i) \(\left|x+1\right|+\left|x+2\right|+\left|x+3\right|=4x\)

Ta có:

\(\left\{{}\begin{matrix}\left|x+1\right|\ge0\\\left|x+2\right|\ge0\\\left|x+3\right|\ge0\end{matrix}\right.\forall x.\)

\(\Rightarrow\left|x+1\right|+\left|x+2\right|+\left|x+3\right|\ge0\) \(\forall x.\)

\(\Rightarrow4x\ge0\)

\(\Rightarrow x\ge0.\)

Lúc này ta có: \(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)=4x\)

\(\Rightarrow x+1+x+2+x+3=4x\)

\(\Rightarrow\left(x+x+x\right)+\left(1+2+3\right)=4x\)

\(\Rightarrow3x+6=4x\)

\(\Rightarrow6=4x-3x\)

\(\Rightarrow6=1x\)

\(\Rightarrow x=6\left(TM\right).\)

Vậy \(x=6.\)

Chúc bạn học tốt!

khùng

khùng thật

không giúp bạn ấy thì thôi đừng chửi người ta thế chứ

\(5x-2.\left(x-1\right)=4.3.125.\left(-25\right).8\)

       \(5x-2x+2=-300000\)

                  \(3x+2=-300000\)

                          \(3x=-300000-2\)

                          \(3x=-300002\)

                             \(x=-\frac{300002}{3}\)

0,8 x 0,04 x 1,25 x 25 x 0,6524 x 0,3476

= ( 0,8 x 1,25 ) x ( 0,04 x 25 ) x ( 0,3476 + 0,5624 )

= 1 x 1 x 0,9

= 1 x 0,9 

= 0,9

10 x 125 x 4 x 25 x 8 

= 10 x ( 125 x 8 ) x ( 4 x 25 )

= 10 x 1 000 x 100 

= 1 000 000 

0,8.0,04.1,25.25.0,6524.0,3476

=(0,8.1,25).(0,04.25).(0,3476+0,5624)

=1.1.0,9

=0,9

10.125.4.25.8

=10.(125.8).(4.25)

=10.1 000.100

=1000000

#HỌC TỐT#

y-5 / y-5 =1

y=5/5=1

a) 2x - 5 = 0

   2x      = 0 + 5

    2x     = 5

  x        = 5:2

  x        = 5/2

b) x^3 - x^5 = 0 

c) -7x + 3 =  0

    -7x       = 0 - 3

     -7x     = -3

      x      = -3 : - 7

      x      = 3/7

e) x^2 - 5x = 0

f ( 3x - 2 ) . ( 5 x^2 + 125 )=0

g) -x + 3/4 = 0

    -x         = 0 - 3/4

     -x         = -3/4

    x          = 3/4

Có mấy câu k bk giải

(4-5x)^3=-1/125

<=> 4-5x = -1/5

<=> -5x = -1/5 -4

<=> -5x = -21/5

<=> x = 21/25

Thank you

Tìm x :

\(5x+x=39-3^{11}:3^9\)

        \(6x=39-3^2\)

        \(6x=39-9\)

        \(6x=30\)

           \(x=30:6\)

           \(x=5\)

Thực hiện phép tính :

\(225:3^2+4^3.125-125:5^2\)

\(=225:9+64.125-125:25\)

\(=25+8000-5\)

\(=8020\)      

a, 6x=39-3^2                          b,225:9+64.125-125:25

    6x=39-9                               =25+64.125-125:25

    6x=30                                  =25+8000-125:25

    x=30:6                                 =25+8000-5

    x=5                                      =8020