5²x-³ - 2.5² = 5² . 3
Tìm số nguyên x , nếu biết
1. 7.4^x=7.4^3
2.3/2.5^x =3/2.5^12
3 . 2^x=2.2^8
4. 5.3^x=7.3^5-2.3^5
1) \(7.4^x=7.4^3\Leftrightarrow4^x=4^3;x=3\)
2) \(\frac{3}{2.5^x}=\frac{3}{2.5^{12}}\Leftrightarrow5^x=5^{12};x=12\)
\(2^x=2.2^8=2^9;x=9\)
4) \(5.3^x=7.3^5-2.3^5\Leftrightarrow5.3^x=3^5.\left(7-2\right)\)
\(\Leftrightarrow3^5.x=3^5.5;x=5\)
Tìm x
5^2x-3-2.5^2=5^2x3
Mình trả lời rồi bạn nhé.
https://olm.vn/cau-hoi/52x-3-252523.8180909322523
Tìm x, biết:
a)2.52.32+{[2.53-(5.x+4).5}}:(22.3.5)}=453
b)\(|x-\frac{1}{3}|=2\)
a) \(2.5^2.3^2+\left\{\left[2.5^3-\left(5x+4\right).5\right]:\left(2^2.3.5\right)\right\}=453\)
\(2.25.9+\left\{\left[2.125-\left(5x+4\right).5\right]:\left(4.3.5\right)\right\}=453\)
\(50.9+\left\{\left[250-\left(5x+4\right).5\right]:60\right\}=453\)
\(450+\left\{\left[250-\left(5x+4\right).5\right]:60\right\}=453\)
\(\left[250-\left(5x+4\right).5\right]:60=453-450\)
\(\left[250-\left(5x+4\right).5\right]:60=3\)
\(250-\left(5x+4\right).5=3.60\)
\(250-\left(5x+4\right).5=180\)
\(\left(5x+4\right).5=250-180\)
\(\left(5x+4\right).5=70\)
\(5x+4=70:5\)
\(5x+4=14\)
\(5x=14-4\)
\(5x=10\)
\(x=10:5\)
\(x=2\)
Vậy \(x=2\)
b) \(\left|x-\frac{1}{3}\right|=2\)
\(\Rightarrow\orbr{\begin{cases}x-\frac{1}{3}=-2\\x-\frac{1}{3}=2\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=\left(-2\right)+\frac{1}{3}\\x=2+\frac{1}{3}\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=\frac{-5}{3}\\x=\frac{7}{3}\end{cases}}\)
Vậy \(x\in\left\{\frac{-5}{7};\frac{7}{3}\right\}\)
a) 5. ( 7 + 48 : x ) = 45
b) 5²x-³ - 2.5² = 5² . 3
A. 7 + 48 : x = 45 : 5 = 9 => 48 : x = 9 - 7 = 2 => x = 48 : 2 = 24.
Tim x
2.5^2.3^2+{[2.5^3-(5x+4).5]}:(262.3.5)}=453
5.3^x+6=2.5^5+3
Mũ cụ thể như thế nào vậy bạn?
5.3^x+6 là $5.3^{x+6}$ hay $5.3^x+6$?
2.5^5+3 là $2.5^{5+3}$ hay $2.5^5+3$??
a)5^x+1=125
b)5^2x-3-2.5^2=5^2.3
c)4^x.3=16
tim x biet 5^(2x-3)-2.5^2=5^2.3
5^(2x-3) = 5^2.3 + 2.5^2
5^(2x-3) = 5^2( 3 + 2)
5^(2x-3) = 5^2.5
5^(2x-3) = 5^3
2x - 3 =3
2x = 6
x = 3
5(x+3^2.5)=300
5.(x + 32 . 5) = 300
x + 45 = 300 : 5 = 60
x = 60 - 45
x = 15
5(x+3^2*5)=300
5(x+9*5)=300
x+9*5=300:5
x+9*5=60
x+45=60
x=60-45
x=15 (thỏa mãn)
Vậy x = 15
Bài giải
5( x + 32 . 5 ) = 300
x + 32 . 5 = 300 : 5
x + 9 . 5 = 60
x + 45 = 60
x = 60 - 45
x = 15
Vậy x = 15