ĐKXĐ: x<>2
\(\dfrac{x-2}{16}=\dfrac{-4}{2-x}\)
=>\(\dfrac{x-2}{16}=\dfrac{4}{x-2}\)
=>\(\left(x-2\right)^2=4\cdot16=64\)
=>\(\left[{}\begin{matrix}x-2=8\\x-2=-8\end{matrix}\right.\)
=>\(\left[{}\begin{matrix}x=10\left(nhận\right)\\x=-6\left(nhận\right)\end{matrix}\right.\)
a,2.(\(\dfrac{1}{4}\)+x)\(^3\)=(\(-\dfrac{27}{4}\))
b,(x+\(\dfrac{1}{2}\))\(^3\):3=\(\dfrac{-1}{81}\)
c,(\(\dfrac{2}{3}\)-x)\(^2\)=1:\(\dfrac{4}{9}\)
d,(2x-\(\dfrac{1}{5}\))\(^2\)+\(\dfrac{16}{25}\)=1
e,(\(\dfrac{2}{5}\)-3x)\(^2\)-\(\dfrac{1}{5}\)=\(\dfrac{4}{25}\)
1,\(\dfrac{3}{16}\)- ( x - \(\dfrac{5}{4}\) ) - ( \(\dfrac{3}{4}\) + \(\dfrac{-7}{8}\) - 1 ) = \(2\dfrac{1}{2}\)
2,\(\dfrac{1}{2}\) . ( \(\dfrac{1}{6}\) - \(\dfrac{9}{10}\) ) = \(\dfrac{1}{5}\) - x + ( \(\dfrac{1}{15}\) - \(\dfrac{-1}{5}\) )
Giúp mik nhanh với ạ .
Tìm \(x\)
a) \(\dfrac{2-x}{4}=\dfrac{3x-1}{3}\)
b) \(\dfrac{x}{7}=\dfrac{x+16}{35}\)
c) \(\sqrt{x^2+1}=3\)
e)\(\dfrac{2-x}{4}=\dfrac{3x-1}{-3}\)\(\) f)\(\dfrac{x}{7}=\dfrac{x+16}{35}\)
Tìm x: \(\dfrac{1}{2}-\dfrac{1}{4}+\dfrac{1}{8}-\dfrac{1}{16} +...-\dfrac{1}{1024}=\dfrac{x}{1024}\)
Câu 1: Tìm x, biết:
a)\(x^2-\dfrac{16}{25}=0\) b)\(\dfrac{2}{5}-\left|\dfrac{1}{2}-x\right|=6\)
C2.Tính giá của biểu thức:
a)\(A=1\dfrac{5}{13}-0,25-\left(2\dfrac{5}{9}+\dfrac{18}{13}-\dfrac{1}{4}\right)\)
b)\(\dfrac{\dfrac{3}{5}.7^2-3.5^6+\dfrac{3}{5}.3^9}{\dfrac{3}{4}.7^2-\dfrac{3}{4}.5^7+\dfrac{3}{4}.3^9}\)
1/ Tìm x,y biết:
a/ \(\dfrac{x}{2}\) = \(\dfrac{y}{5}\) và x+y=-21
b/ 7x = 3y và x-y=16
c/ \(\dfrac{x}{y}\) = \(\dfrac{5}{9}\) và 3x+2x=66
d/ \(\dfrac{x}{15}\) = \(\dfrac{y}{7}\) và x-2y=16
e/ \(\dfrac{x}{5}\) = \(\dfrac{y}{2}\) và x × y = 1000
2/ Tìm x,y,z biết
\(\dfrac{x}{13}\) = \(\dfrac{y}{7}\) = \(\dfrac{z}{5}\) và x-y-z=6
1, 3x = \(\dfrac{9^8}{27^3.81^2}\)
2,\(\dfrac{2^{4-x}}{16^5}\)= 326
3,\(\dfrac{2^{2x-3}}{4^{10}}\) = 83. 165
giúp em nhanh với ạ . mik đang gấp .
Câu 1: Thực hiện phép tính
a, \(40\dfrac{1}{4}:\dfrac{5}{7}-25\dfrac{1}{4}:\dfrac{5}{7}-\dfrac{1}{2021}\)
b, \(\left|\dfrac{-5}{9}\right|.\sqrt{81}-2021^0.\dfrac{16}{25}\)
Câu 2: Tìm x
\(3\left(x-\dfrac{1}{3}\right)-7\left(x+\dfrac{3}{7}\right)=-2x+\dfrac{1}{3}\)
