\(a,\Rightarrow\left(4x-1\right)^2=25=5^2=\left(-5\right)^2\\ \Rightarrow\left[{}\begin{matrix}4x-1=5\\4x-1=-5\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{3}{2}\\x=-1\end{matrix}\right.\\ b,\Rightarrow2^x\left(1+2^3\right)=144\\ \Rightarrow2^x=144:9=16=2^4\Rightarrow x=4\\ c,\Rightarrow3^{2x+3}=3^{2\left(x+3\right)}\\ \Rightarrow2x+3=2x+6\Rightarrow0x=3\left(vô.lí\right)\\ \Rightarrow x\in\varnothing\)

\(1,\\ a,2^x=16=2^4\Rightarrow x=4\\ b,3^{x+1}=9^x=3^{2x}\\ \Rightarrow x+1=2x\Rightarrow x=1\\ c,2^{3x+2}=4^{x+5}=2^{2\left(x+5\right)}\\ \Rightarrow3x+2=2x+10\Rightarrow x=8\\ d,3^{2x-1}=243=3^5\\ \Rightarrow2x-1=5\Rightarrow x=3\\ 2,\\ a,2^{225}=8^{75}< 9^{75}=3^{150}\\ b,2^{91}=\left(2^{13}\right)^7=8192^7>3125^7=\left(5^5\right)^7=5^{35}\\ c,99^{20}=\left(99^2\right)^{10}< \left(99\cdot101\right)^{10}=9999^{10}\\ 3,\\ a,12^8\cdot9^{12}=2^{16}\cdot3^8\cdot3^{24}=2^{16}\cdot3^{32}=\left(2\cdot3^2\right)^{16}=18^{16}\\ b,75^{20}=\left(3\cdot5^2\right)^{20}=3^{20}\cdot5^{40}=\left(3^{20}\cdot5^{10}\right)\cdot5^{30}=\left(3^2\cdot5\right)^{10}\cdot5^{30}=45^{10}\cdot5^{30}\)

Bài 1:

a) \(\Rightarrow2^x=2^4\Rightarrow x=4\)

b) \(\Rightarrow3^{x+1}=3^{2x}\Rightarrow x+1=2x\Rightarrow x=1\)

c) \(\Rightarrow2^{3x+2}=2^{2x+10}\Rightarrow3x+2=2x+10\Rightarrow x=8\)

d) \(\Rightarrow3^{2x-1}=3^5\Rightarrow2x-1=5\Rightarrow x=3\)

Bài 2:

a) \(2^{225}=\left(2^3\right)^{75}=8^{75}< 9^{75}=\left(3^2\right)^{75}=3^{150}\)

b) \(2^{91}=\left(2^{13}\right)^7=8192^7>3125^7=\left(5^5\right)^7=5^{35}\)

c) \(99^{20}=\left(99^2\right)^{10}=9801^{10}< 9999^{10}\)

Bài 3:

a) \(12^8.9^{12}=\left(4.3\right)^8.9^{12}=4^8.3^8.9^{12}=2^{16}.9^4.9^{12}=2^{16}.9^{16}=\left(2.9\right)^{16}=18^{16}\)

b) \(75^{20}=\left(75^2\right)^{10}=5625^{10}=\left(45.125\right)^{10}=45^{10}.125^{10}=45^{10}.5^{30}\)

a. 27x - 9x = 1 + 1

     18x = 2

         x = \(\frac{1}{9}\)

b. 16x + 1 = 32x - 2

    16x - 32x = -2 -1

        -16x     = -3

             x = \(\frac{3}{16}\)

 Dương Trần làm sai rồi 

chắc chắn 100% ko phải toán lớp 6

Đáp án  m ∈ ∅

Đáp án B

Đáp án B

P T   9 x + 9 x 3 = 2 2 .2 x + 2 .2 x ⇔ 4 9 9 x = 3 2 .2 x ⇔ 9 2 x = 9 2 4 ⇔ x = log 9 2 9 2 4 ⇒ a = log 9 2 9 2 4

⇒ P = log 9 2 9 2 4 + 1 2 log 9 2 2 = log 9 2 9 2 4 log 9 2 2 = log 9 2 9 2 = 1

1. a) \(8x^3-32x=8x\left(x^2-4\right)=8x\left(x-4\right)\left(x+4\right)\)

b) \(y^3+64+\left(y+4\right)\left(y-16\right)=\left(y^3+4^3\right)+\left(y+4\right)\left(y-16\right)\)

\(=\left(y+4\right)\left(y^2-4y+16\right)+\left(y+4\right)\left(y-16\right)=\left(y+4\right)\left(y^2-4y+16+y-16\right)\)

\(=\left(y-4\right)\left(y^2-3y\right)=\left(y-4\right)y\left(y-3\right)\)

2) a)

\(4x^3-9x=0\)

\(\Leftrightarrow x\left(4x^2-9\right)=0\)

\(\Leftrightarrow x\left(2x+3\right)\left(2x-3\right)=0\)

<=> x=0 hoặc 2x+3=0 hoặc 2x-3=0

<=> x=0 hoặc x=-3/2 hoặc x=3/2

b) \(A=x^3-9x^2+27x-27=x^3-3.x^2.3+3.x.3^2-3^3=\left(x-3\right)^3\)

Tại x=203

A=(203-3)³=200³

Bài 1 :

a) \(8x^3-32x\)

\(=8x\left(x^2-4\right)\)

\(=8x\left(x-2\right)\left(x+2\right)\)

b) \(y^3+64+\left(y+4\right)\left(y-16\right)\)

\(=\left(y^3+4^3\right)+\left(y+4\right)\left(y-16\right)\)

\(=\left(y+4\right)\left(y^2-4y+16\right)+\left(y+4\right)\left(y-16\right)\)

\(=\left(y+4\right)\left(y^2-4x+16+y-16\right)\)

\(=\left(y+4\right)\left(y^2+y-4x\right)\)

Bài 2 :

a) \(4x^3-9x=0\)

\(x\left(4x^2-9\right)=0\)

\(x\left[\left(2x\right)^2-3^2\right]=0\)

\(x\left(2x-3\right)\left(2x+3\right)=0\)

\(\Rightarrow\hept{\begin{cases}x=0\\2x-3=0\\2x+3=0\end{cases}\Rightarrow\hept{\begin{cases}x=0\\x=\frac{3}{2}\\x=\frac{-3}{2}\end{cases}}}\)

P.s: ở trên dùng ngoặc vuông nhé

b) \(A=x^3-9x^2+27x-27\)

\(A=x^3-3\cdot x^2\cdot3+3\cdot x\cdot3^2-3^3\)

\(A=\left(x-3\right)^3\)

Thay x = 203 vào biểu thức ta có :

\(A=\left(203-3\right)^3\)

\(A=200^3\)

\(A=8000000\)

a) Ta có:  6 x - 1   =   6 2  nên x -1 = 2, đo đó x = 3.

b) Ta có:  3 2 x + 1   =   3 3  nên 2x +1 = 3, do đó x = 1.

c) Ta có:  x 50   =   x  nên  x 50   -   x   =   0 , do đó  x . x 49   -   1   =   0

Vì thế x = 0 hoặc x = 1. 

3 2 x + 1 + 10 4 x + 2 − 6 6 x + 3 = 12 26 ⇒ 3 2 x + 1 + 10 2 2 x + 1 − 6 3 2 x + 1 = 12 26 ⇒ 3 2 x + 1 + 5 2 x + 1 − 2 2 x + 1 = 12 26 ⇒ 3 + 5 − 2 2 x + 1 = 12 26 ⇒ 6 2 x + 1 = 6 13 ⇒ 2 x + 1 = 13 ⇒ x = 6