Question

[Dương Taurus]

1)

a) (3x - 7)⁵ = 32

b) (4x - 1)³ =-27 . 125

c)3^{4x + 4} = 81^x+3

d) (x - 5)⁷ = (x - 5)⁹ (x \(\ge\)5⁹)

2)

100 < 5^2x-3\(\le\) 5⁹

25 <3^x <260

3)

a) 10 . \(\dfrac{4^6.9^5+6^9.120}{8^4.3^{12}-6^{11}}\)

b) 1 +2+2²+2³+...+2⁴⁹+2⁵⁰

c)5 + 5³+5⁵+...+5⁴⁷+5⁴⁹

Giúp mình với!!!!!!!!!!!! Mai nộp bài rồi

Answer 1

[Lê Gia Bảo]

Đặt \(A=5+5^3+5^5+....+5^{47}+5^{49}\)

\(\Rightarrow5^2A=5^3+5^5+5^7+.....+5^{49}+5^{51}\)

\(\Rightarrow5^2A-A=\left(5^3+5^5+5^7+....+5^{49}+5^{51}\right)-\left(3+3^3+3^5+....+5^{47}+5^{49}\right)\)

\(\Rightarrow24A=5^{51}-5\)

\(\Rightarrow A=\dfrac{5^{51}-5}{24}\)

Vậy ............................................................

Answer 2

[Lê Gia Bảo]

1)a) \(\left(3x-7\right)^5=32\Rightarrow\left(3x-7\right)^5=2^5\)

\(\Rightarrow3x-7=2\Rightarrow3x=9\Rightarrow x=3\)

Vậy \(x=3\)

b) \(\left(4x-1\right)^3=-27.125\)

\(\Rightarrow\left(4x-1\right)^3=-3^3.5^3=-15^3\)

\(\Rightarrow4x-1=-15\Rightarrow4x=-14\Rightarrow x=-3,5\)

Vậy \(x=-3,5\)

c) \(3^{4x+4}=81^{x+3}\Rightarrow3^{4x+4}=3^{4x+12}\)

\(\Rightarrow4x+4=4x+12\)

\(\Rightarrow4x=4x+8\)

\(\Rightarrow x\in\varnothing\)

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

\(\Rightarrow\left(x-5\right)^7-\left(x-5\right)^9=0\)

\(\Rightarrow\left(x-5\right)^7.\left[1-\left(x-5\right)^2\right]=0\)

\(\Rightarrow\left[{}\begin{matrix}\left(x-5\right)^7=0\\1-\left(x-5\right)^2=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=5\\\left(x-5\right)^2=1\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=5\\x-5=-1\\x-5=1\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=5\\x=4\\x=6\end{matrix}\right.\)

Vậy \(\left[{}\begin{matrix}x=5\\x=4\\x=6\end{matrix}\right.\)