x x 7= 70

x = 70 : 7

x = 10

X x 7= 70

X = 70 : 7

X = 10

\(a,\Rightarrow6x+70=130\Rightarrow6x=60\Rightarrow x=10\\ b,\Rightarrow240=\left(x+70\right):14-40\\ \Rightarrow\left(x+70\right):14=280\\ \Rightarrow x+70=3920\Rightarrow x=3850\\ c,\Rightarrow x-15=75\Rightarrow x=90\\ d,\Rightarrow\left(x+175\right):5=680-30=650\\ \Rightarrow x+175=3250\Rightarrow x=3075\\ e,\Rightarrow x-4867=1004523\Rightarrow x=1009390\\ f,\Rightarrow x+32-17=24\Rightarrow x=9\\ g,\Rightarrow3\left(x+1\right)=54\Rightarrow x+1=18\Rightarrow x=17\\ h,\Rightarrow19\left(35:x+3\right)=152\\ \Rightarrow35:x+3=8\Rightarrow35:x=11\Rightarrow x=\dfrac{35}{11}\)

ĐKXĐ: \(\hept{\begin{cases}x\ne10\\x\ne-70\end{cases}}\)

\(\frac{x-20}{x-10}=\frac{x+40}{x+70}\)

\(\Rightarrow\left(x-20\right)\left(x+70\right)=\left(x+40\right)\left(x-10\right)\)

\(\Rightarrow x^2+70x-20x-1400=x^2-10x+40x-400\)

\(\Rightarrow20x=1000\Rightarrow x=50\)

                                                 Vậy x = 50

x⁷⁰ = x

=> x⁷⁰ - x = 0

=> x⁶⁹.x - x = 0

=> x.( x⁶⁹ - 1 ) = 0

=> x = 0 hoặc x⁶⁹ - 1 = 0

=> x = 0 hoặc x⁶⁹ = 1

=> x = 0 hoặc x = 1

Vậy x = { 0 ; 1 }

Vì x^70 = x^1 mà 70 > 1 => x = 1 hoặc x = 0

Vậy x = 0 hoặc x = 1

x=0 hoặc x=1

a) x  x 4 = 36                                        b) 70 :  x  = 7

            x = 36 : 4                                             x = 70 : 7

                                x = 9                                                     x = 10

\(25:x=16:10\)
\(\Rightarrow25:x=1,6\)
\(\Rightarrow x=25:1,6\)
\(\Rightarrow x=15,625\)

\(5,2\times x=70-12,8\)
\(\Rightarrow5,2\times x=57,2\)
\(\Rightarrow x=57,2:5,2\)
\(\Rightarrow x=11\)

a: =>25:x=1,6

hay x=15,625

b: =>5,2x=57,2

hay x=11

 25 : X = 16 :10

\(\Rightarrow25:x=1,6\\ \Rightarrow x=15,625\)            

5,2 x X = 70 - 12,8

\(5,2\times x=57,2\\ \Rightarrow x=11\)

\(\dfrac{-270}{x}+20=-70\)

\(⇔\dfrac{-270}{x}=-70-20\)

\(⇔x=\dfrac{-270}{-70-20}\)

\(⇔x=3\)

 70 - x = 22,5 : 4,5=5

 =>x=70-5=65.

70 - x = 5

x= 70 - 5 

x = 65

70- x = 22,5:4,5

70-x = 5

x=70-5

x=65         

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