(x⁵⁴)²=5¹⁰⁸
(5\(^{ }\)^x)²=125³:5²
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4^3=64 5^2=10
64 x 125 - 125 x 10
= 8000 - 1250
=6750
đáp án : 6750
a: \(6^x=5\)
=>\(x=log_65\)
b: \(7^{3-x}=5\)
=>\(3-x=log_75\)
=>\(x=3-log_75\)
c: \(\left(\dfrac{3}{5}\right)^{x-2}=\dfrac{27}{125}\)
=>\(\left(\dfrac{3}{5}\right)^{x-2}=\left(\dfrac{3}{5}\right)^3\)
=>x-2=3
=>x=5
d: \(\left(\dfrac{4}{5}\right)^x=\dfrac{5}{4}\)
=>\(\left(\dfrac{4}{5}\right)^x=\left(\dfrac{4}{5}\right)^{-1}\)
=>x=-1
a.
\(6^x=5\Rightarrow x=log_65\)
b.
\(7^{3-x}=5\Rightarrow3-x=log_75\)
\(\Rightarrow x=3-log_75\)
c.
\(\left(\dfrac{3}{5}\right)^{x-2}=\dfrac{27}{125}\Rightarrow x-2=log_{\dfrac{3}{5}}\left(\dfrac{27}{125}\right)\)
\(\Rightarrow x-2=3\Rightarrow x=5\)
d.
\(\left(\dfrac{4}{5}\right)^x=\dfrac{5}{4}\Rightarrow\left(\dfrac{4}{5}\right)^x=\left(\dfrac{4}{5}\right)^{-1}\)
\(\Rightarrow x=-1\)
c: (x-y+4)^2
=x^2+y^2+16+2*x*(-y)-2*y*4+2*x*4
=x^2+y^2+16-2xy-8y+8x
h; x^3y^6z^9-125
\(=\left(xy^2z^3\right)^3-5^3\)
\(=\left(xy^2z^3-5\right)\left(x^2y^4z^6+5xy^2z^3+25\right)\)
b: Ta có: \(\left(x+5\right)^3-x^3-125\)
\(=x^3+15x^2+75x+125-x^3-125\)
\(=15x^2+75x\)
\(\left(x^{54}\right)^2=x^{54.2}=x^{108}\\ Mà:\left(x^{54}\right)^2=5^{108}\Leftrightarrow x^{108}=5^{108}=\left(-5\right)^{108}\\ Vậy:x=5.hoặc.x=-5\\ ---\\ \left(5^x\right)^2=125^3:5^2\\ \Leftrightarrow5^{2x}=\left(5^3\right)^3:5^2=5^9:5^2=5^7\\ Vậy:2x=7\\ Vậy:x=\dfrac{7}{2}\)
\(\left(x^{54}\right)^2=5^{108}\\ \Rightarrow x^{108}=5^{108}\)
\(\Rightarrow x=5.\)
\(\left(5^x\right)^2=125^3:5^2\\ \Rightarrow\left(5^x\right)^2=\left(5^3\right)^3:5^2\\ \Rightarrow\left(5^x\right)^2=5^9:5^2\\ \Rightarrow\left(5^x\right)^2=5^7\\ \Rightarrow x.2=5\\ \Rightarrow x=2,5\)