a)8⁸

b)2³.3²

c)10⁶

k mik nha

a,8^8

b,2^3.3^2

c, 10.100.1000=1000.1000=1000^2

a) 2^x.4=128               b) (2x+1)³=125

    2^x   =128:4                 2³x+1³=125

    2^x    =3                        8x+1=125

Vì 32=2⁵                             8x    =125-1

Vậy x=5                           8x    =124

                                          x    =124:8

                                          x    =15.5

\(2^x\cdot4=128\Leftrightarrow2^x\cdot2^2=128\Leftrightarrow2^{x+2}=128\Leftrightarrow2^{x+2}=2^7\Leftrightarrow x+2=7\Leftrightarrow x=5\)

\(\left(3x-1\right)^2=64\Leftrightarrow\left(3x-1\right)^2=8^2\Leftrightarrow3x-1=8\Leftrightarrow3x=9\Leftrightarrow x=3\)

\(\left(2x+1\right)^3=125\Leftrightarrow\left(2x+1\right)^3=5^3\)

\(\Leftrightarrow2x+1=5\Leftrightarrow2x=5-1\Leftrightarrow2x=4\)

\(\Leftrightarrow x=4:2\Leftrightarrow x=2\)

\(\left(x-5\right)^4=\left(x-5\right)^6\)

Vì \(\left(x-5\right)^4\ne\left(x-5\right)^6\Leftrightarrow x=\varnothing\)

a) \(3.2^2+2^3:2+1234^0\)

\(\Rightarrow3.2^2+2^2+1\)

\(\Rightarrow2^2\left(3+1\right)\)\(+1\)

=>\(2^2.4+1\)\(\Rightarrow4.4+1=17\)

b) \(\left(2^3.5+2^2.25\right)\)\(\div20-5\)

=\(\left(40+100\right):20-5\)

=\(140:20-5=7-5=2\)

=

các ước của 350 là : Ư( 350 ) = { 1 ; 2 ; 5 ; 7 ; 10 ; 14 ; 25 ; 35 ; 50 ;70 ; 175 ;350 }

Vậy , số 350 có tất cả 12 ước số

học tốt 

~ tfboys ~

nếu tính cả số âm thì 350 có 24 ước! Ư₍₃₅₀₎={1,-1,2,-2,5,-5,7,-7,10,-10,14,-14,25,-25,35,-35,50,-50,70,-70,175,-175,350,-350}

<<học tốt nha>>

a) \(x\cdot x^2\cdot x^3\cdot x^4=1024\)

\(x^{1+2+3+4}=1024\)

\(x^{10}=1024\)

\(x^{10}=2^{10}\)

\(\Rightarrow x=2\)

b) \(\left(x+5\right)\cdot2^3-2^2\cdot5=2^2\cdot3\cdot5\)

\(2^2\cdot\left[2\left(x+5\right)-5\right]=2^2\cdot15\)

\(2^2\cdot\left[2x+10-5\right]=2^2\cdot15\)

\(2^2\cdot\left[2x+5\right]=2^2\cdot15\)

\(\Rightarrow2x+5=15\)

\(\Rightarrow2x=15+5=20\)

\(\Rightarrow x=\frac{20}{2}=10\)

a)\(x.x^2.x^3.x^4=1024\Rightarrow x^{1+2+3+4}=2^{10}\Rightarrow x^{10}=2^{10}\Rightarrow x=2\)

b)\(\left(x+5\right).2^3-2^2.5=2^2.3.5\Rightarrow\left(x+5\right).2^3=2^2.3.5+2^2.5\)

\(\Rightarrow\left(x+5\right).2^3=2^2.5.\left(3+1\right)=2^2.5.2^2=2^4.5\)

\(\Rightarrow x+5=\frac{2^4.5}{2^3}=10\Rightarrow x=5\)

a) \(\left(x-5\right)^2-18=46\)

\(\left(x-5\right)^2=46+18\)

\(\left(x-5\right)^2=64\)

\(\Rightarrow\left(x-5\right)^2=8^2\)hoặc \(\left(x-5\right)^2=\left(-8\right)^2\)

             \(x-5=8\)                   \(x-5=-8\)

      \(x=8+5=13\)          \(x=-8+5=-3\)

Vậy \(x=13\)hoặc \(x=-3\)

a)\(\left(x-5\right)^2-18=46\Rightarrow\left(x-5\right)^2=64\)

\(\Rightarrow\orbr{\begin{cases}x-5=8\\x-5=-8\end{cases}\Rightarrow\orbr{\begin{cases}x=13\\x=-3\end{cases}}}\)

b)\(2^{15}\left(x+3\right)=2^{18}-2^{17}\Rightarrow2^{15}\left(x+3\right)=2^{17}\left(2-1\right)=2^{17}\)

\(\Rightarrow x+3=2^{17}:2^{15}=2^{17-15}=2^2\Rightarrow x=1\)

   243 . 3 . 27 + 32 . 8

= 3⁵ . 3 . 3³ + 2⁵ . 2³

= 3⁹ + 2⁸

Hk tốt

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