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Ta có ; \(5^x.\left(5^3\right)^2=625\)
\(\Leftrightarrow5^x.5^6=625\)
\(\Leftrightarrow5^{x+6}=5^4\)
<=> x + 6 = 4
<=> x = -2
a,ta có
\(5^x\left(5^3\right)^2=625\)
\(5^x.5^6=5^4\)
\(5^{x+6}=5^4\)
\(x+6=4\)
\(x=-2\)
b, đề sai hay sao đó x=48,9287366
a: \(\Leftrightarrow\left(\dfrac{12}{25}\right)^x=\dfrac{9}{25}-\dfrac{81}{625}=\dfrac{144}{625}\)
=>x=2
b: =>3x-1=-4
=>3x=-3
hay x=-1
b, \(\left(5x+1\right)^2=\dfrac{36}{49}\)
\(\left(5x+1\right)^2=\left(\pm\dfrac{6}{7}\right)^2\)
\(\Rightarrow\left[{}\begin{matrix}5x+1=\dfrac{6}{7}\\5x+1=-\dfrac{6}{7}\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}5x=-\dfrac{1}{7}\\5x=\dfrac{-13}{7}\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=-\dfrac{1}{35}\\x=\dfrac{-13}{35}\end{matrix}\right.\)
Vậy .....
Nguyễn Thanh Hằng ;Hồng Phúc Nguyễn ;Mới vô; ... các bn giúp mik vs mik đang cần gấp !
a, 24-x=32=25
=> 4-x=5
<=> x=-1
b, (x+1,5)2+(y-2,5)10=0
Vì (x+1,5)2\(\ge\)0, (y-2,5)10\(\ge\)0
\(\Rightarrow\hept{\begin{cases}x+1,5=0\\y-2,5=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=-1,5\\y=2,5\end{cases}}}\)
a)\(2^{4-x}\)=32
=>\(2^{4-x}\)=32=\(2^5\)
=>4-x=5
=>x=4-5=-1
=>x=-1
Cau a la 1
Cau b la 1215
Cau c la 768
Cau d la \(\frac{4185}{13}\)
\(\frac{4^2.4^3}{2^{10}}=\frac{4^{2+3}}{\left(2^2\right)^5}=\frac{4^5}{4^5}=1\)
\(\frac{\left(0,6\right)^5}{\left(0,2\right)^6}=\frac{\left(0,2.3\right)^5}{\left(0,2\right)^6}=\frac{\left(0,2\right)^5.3^5}{\left(0,2\right)^6}=\frac{3^5}{0,2}=1215\)
\(\frac{2^7.9^3}{6^5.8^2}=\frac{2^2.2^5.\left(3^2\right)^3}{\left(2.3\right)^5.\left(2^3\right)^2}=\frac{2^2.2^5.3^6}{2^5.3^5.2^6}=\frac{3}{2^4}=\frac{3}{16}\)
\(\frac{6^3+3.6^2+3^3}{-13}=\frac{2^3.3^3+3.\left(2.3\right)^2+3^3}{-13}=\frac{2^3.3^3+3.2^2.3^2+3^3}{-13}=\frac{3^3.\left(2^3+2^2+1\right)}{-13}=\frac{3^3.13}{-13}=\left(-3\right)^3=-27\)
172x2-79:983=2-3
172x2-79:(493.23)=2-3
172x2-79:(76.23)=2-3
172x2-(79:76):23=2-3
172x2-73:23=2-3
172x2-(7/2)3=2-3
172x2=2-3+(7/2)3
172x2=(1/8)+(343/8)
172x2=344/8
172x2=43
x2=172:43
x2=4
=> x = 2 hoặc x = -2
Vậy x = 2 ; x = -2
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