\(\Rightarrow9\left(x-1\right)^2-2=\dfrac{1}{4}\\ \Rightarrow9\left(x-1\right)^2=\dfrac{9}{4}\\ \Rightarrow\left(x-1\right)^2=4\\ \Rightarrow\left[{}\begin{matrix}x-1=2\\1-x=2\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=3\\x=-1\end{matrix}\right.\)
1) \(\dfrac{-5}{\dfrac{12}{\left|\dfrac{2}{3}x+\dfrac{1}{2}\right|}}\)= \(\dfrac{\dfrac{-4}{9}}{\dfrac{8}{15}}\)
2) \(\dfrac{\left|3x-5\right|}{-3}\)= \(\dfrac{\dfrac{-5}{6}}{\dfrac{4}{9}}\)
cho x,y,z khác 0 thỏa mãn: \(\dfrac{x}{1}=\dfrac{y}{2}=\dfrac{z}{3}\). CMR: ( x+y+z ). \(\left(\dfrac{1}{x}+\dfrac{4}{y}+\dfrac{9}{z}\right)\)
Tìm x trong tỉ lệ thức
a) \(-0,52:x=-9,36:16,38\)
b) \(2\dfrac{2}{5}:x=1\dfrac{7}{9}:0,2\)
c)\(\left(\dfrac{2}{5}x\right):\dfrac{1}{3}=1\dfrac{1}{3}:\dfrac{4}{5}\)
d) \(0,3:1\dfrac{1}{3}=\dfrac{2}{5}:\left(3x+6\right)\)
e) \(\dfrac{x}{-15}=\dfrac{-60}{x}\)
f) \(\dfrac{x-1}{-15}=\dfrac{-60}{x-1}\)
g) \(\dfrac{x-1}{7}=\dfrac{9}{x+1}\)
h) \(\dfrac{x-2}{x-1}=\dfrac{x+4}{x+7}\)
Tìm x, biết :
\(a.3\dfrac{4}{5}:40\dfrac{8}{15}=0,25:x\)
\(b.\left(x+1\right):\dfrac{5}{6}=20:3\)
\(c.\dfrac{7}{x-1}=\dfrac{x+1}{9}\)
Tìm số hửu tỉ x biết \(\left(\dfrac{1}{3}+x\right):\left(x+\dfrac{3}{4}\right)=\dfrac{7}{9}\)
a, Tìm giá trị nhỏ nhất
A= \(\left(2x+\dfrac{1}{3}\right)^4-1\)
b, Tìm giá trị lớn nhất
B=\(-\left(\dfrac{4}{9}x-\dfrac{2}{15}\right)^6+3\)
1 .Tìm x , y , z biết rằng :
\(\dfrac{2x}{3}=\dfrac{3y}{4}=\dfrac{4z}{5}\) và x + y + z = 49
2.Thực hịên phép tính :
\(2^3+3\times\left(\dfrac{1}{2}\right)^2-\dfrac{1}{2^2}+\text{[}\left(-2\right)^2:\dfrac{1}{2}\times8\)
Giúp mik vs , cần gấp lắm .
1) \(\dfrac{x}{\dfrac{-5}{9}}\)= \(\dfrac{\dfrac{4}{3}}{\dfrac{-2}{5}}\)
2) \(\dfrac{7}{\dfrac{5}{3x}}\)= \(\dfrac{-\dfrac{4}{9}}{\dfrac{5}{6}}\)
Tìm x:
a) \(\dfrac{x-3}{x+5}=\dfrac{5}{7}\) b) \(\dfrac{7}{x-1}=\dfrac{x+1}{9}\)
mọi người ơi giúp mik với ai làm đc mik tick cho
