a) \(\frac{2}{5}\)+ X = \(\frac{13}{15}\) - \(\frac{1}{3}\)

 \(\frac{2}{5}+X=\frac{8}{15}\)

            \(X=\frac{8}{15}-\frac{2}{5}\)

             \(X=\frac{2}{15}\)

a) 2/5 + x = 13/15 - 1/3

2/5 + x = 8/15   

         x = 8/15 - 2/5

         x = 2/15

b) x - 2/9 = 2/3 x 2

x - 2/9 = 4/3

         x = 4/3 + 2/9 

          x = 14/9

4*X +50=74

4*X=74-50=24

4*X=24/4=6

a)

 \(\left(2x-15\right)^5=\left(2x-15\right)^3\\ \Leftrightarrow\left(2x-15\right)^5-\left(2x-15\right)^3=0\\ \Leftrightarrow\left(2x-15\right)^3.\left[\left(2x-15\right)^2-1\right]=0\\ \Leftrightarrow\left[{}\begin{matrix}2x-15=0\\\left(2x-15\right)^2-1=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}2x-15=0\\\left(2x-15-1\right).\left(2d-15+1\right)=0\end{matrix}\right.\\\Leftrightarrow\left[{}\begin{matrix}2x-15=0\\2x-16=0\\2x-14=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{15}{2}\\x=8\\x=7\end{matrix}\right. \)

b) \(\left(7x-11\right)^3=\left(-3\right)^2.15+208\\ \Leftrightarrow\left(7x-11\right)^3=343=7^3\\ \Leftrightarrow7x-11=7\\ \Leftrightarrow x=\dfrac{18}{7}\)

4/5=20/25

15/25=15/25

\(\dfrac{15}{25}giữ.nguyên;\dfrac{4}{5}=\dfrac{4\times5}{5\times5}=\dfrac{20}{25}\)

3/15, 3/5, 6/5, 8/5

giúp mình với, đi mà mọi người

mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm

x/2013 - 1/10 - 1/15 - 1/21 - ... - 1/120 = 5/8
x/2013 – (2/20 + 2/30 + 2/42 + … + 2/240) = 5/8
x/2013 – 2 x (1/(4x5) + 1/(5x6) + 1/(6x7) + … + 1/(15x16)) = 5/8
x/2013 – 2 x (1/4 – 1/16) = 5/8
x/2013 – 2 x 3/16 = 5/8
x/2013 = 5/8 + 6/16 = 1
x = 2013

đây là đáp án của tôi

x/2013 - 1/10 - 1/15 - 1/21 - ... - 1/120 = 5/8
x/2013 – (2/20 + 2/30 + 2/42 + … + 2/240) = 5/8
x/2013 – 2 x (1/(4x5) + 1/(5x6) + 1/(6x7) + … + 1/(15x16)) = 5/8
x/2013 – 2 x (1/4 – 1/16) = 5/8
x/2013 – 2 x 3/16 = 5/8
x/2013 = 5/8 + 6/16 = 1
x = 2013

4. |x + 1| - 1 = |-15|

4. |x + 1| - 1 = 15

4. |x + 1|      = 15 + 1

4. |x + 1|      = 16

    |x + 1|      = 16 : 4

    |x + 1|      = 4

=> x + 1 = 4 hoặc x + 1 = -4

     + x + 1 = 4

        x       = 4 - 1

        x       = 3

     + x + 1 = -4

        x       = -4 - 1

        x       = -4 + (-1)

        x       = -5

Vậy x = 3 hoặc x = -5

4.|x+1|-1=|-15|

4.|x+1|-1=15

4.|x+1|=15+1

4.|x+1|=16

|x+1|=16:4

|x+1|=4

=>x+1=4 hoặc x+1=-4

=>x=3 hoặc x=-5

Vậy x=3 hoặc x=-5

Tích mk vs ạ....