Tìm x:
x-5/25=4/x-5
Mn cho mik cách giải ạ
Cảm ơn nhiều ạ
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2x + 2x+4 = 544
\(\Leftrightarrow\)2x . 1 + 2x . 24 = 544
\(\Leftrightarrow\)2x . 17 = 544
\(\Leftrightarrow\)2x = 32
\(\Leftrightarrow\)x = 5
\(-\left|1,7-x\right|-\dfrac{5}{3}=\dfrac{2}{3}\\ \Rightarrow\left|1,7-x\right|=-\dfrac{5}{3}-\dfrac{2}{3}=-\dfrac{7}{3}\left(l\right)\)
Vậy không có giá trị x thoả mãn
a) \(\left(2x-1\right)^2-25=0\)
\(\left(2x-1\right)^2=0+25=25\)
\(\left(2x-1\right)^2=5^2=\left(-5\right)^2\)
\(\Rightarrow\left[\begin{array}{nghiempt}2x-1=5\\2x-1=-5\end{array}\right.\Rightarrow\left[\begin{array}{nghiempt}2x=6\\2x=-4\end{array}\right.\Rightarrow\left[\begin{array}{nghiempt}x=3\\x=-2\end{array}\right.\)
b) \(8x^3-50x=0\)
\(2x\left(4x^2-25\right)=0\)
\(\Rightarrow\left[\begin{array}{nghiempt}2x=0\\4x^2-25=0\end{array}\right.\Rightarrow\left[\begin{array}{nghiempt}x=0\\4x^2=25\Rightarrow x^2=\frac{25}{4}\Rightarrow\left[\begin{array}{nghiempt}x=\frac{5}{2}\\x=-\frac{5}{2}\end{array}\right.\end{array}\right.\)
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1. KARAOKE SING
2. at HOMESTAY
3,VISIT SON MY RULES4,EXPERIENCE Phong Nha - Ke Bang National Parkit's great, come to vietnam my country, i will take you to many places. That promise
(x-5) . (x-5)=25.4
(x-5) . (x-5)=100
10.10=100
Vậy x=15
\(\frac{x-5}{25}=\frac{4}{x-5}\)
\(\Leftrightarrow\left(x-5\right)\left(x-5\right)=25.4\)
\(\left(x-5\right)^2=100\)
\(\left(x-5\right)^2=\pm10^2\)
\(\Rightarrow\hept{\begin{cases}x-5=10\\x-5=-10\end{cases}\Rightarrow\hept{\begin{cases}x=15\\x=-5\end{cases}}}\)