\(\Rightarrow10x=-4.3\)
\(\Rightarrow10x=-12\)
\(\Rightarrow x=\dfrac{-6}{5}\)
\(\dfrac{-4}{x}=\dfrac{10}{3}\)
\(\Rightarrow x=-4:\dfrac{10}{3}\)
\(\Rightarrow x=-4.\dfrac{3}{10}\)
\(\Rightarrow x=-\dfrac{6}{5}\)
Vậy \(x=\dfrac{-6}{5}\)
\(\Rightarrow10x=-4.3\)
\(\Rightarrow10x=-12\)
\(\Rightarrow x=\dfrac{-6}{5}\)
\(\dfrac{-4}{x}=\dfrac{10}{3}\)
\(\Rightarrow x=-4:\dfrac{10}{3}\)
\(\Rightarrow x=-4.\dfrac{3}{10}\)
\(\Rightarrow x=-\dfrac{6}{5}\)
Vậy \(x=\dfrac{-6}{5}\)
Tìm x,y,z biết:
a, x : y : z = 10 : 3 : 4 và x + 2y - 3z = -20
b, \(\dfrac{x}{2}\) = \(\dfrac{y}{3}\) và \(\dfrac{y}{5}\) = \(\dfrac{z}{4}\) và x - y + z = -49
c, \(\dfrac{x}{2}\)= \(\dfrac{y}{3}\) =\(\dfrac{z}{4}\) và xy + \(z^2\)= 88
d, \(\dfrac{x}{5}\)= \(\dfrac{y}{7}\) = \(\dfrac{z}{3}\) và \(x^2\) + \(y^2\) + \(z^2\) = 415
Giải hộ mk nha
b) -x - 2 = \(\dfrac{5}{4}\) c) \(\dfrac{4}{3}-\left(x-\dfrac{1}{5}\right)=\left|\dfrac{-3}{10}+\dfrac{1}{2}\right|-\dfrac{1}{6}\) d) \(\dfrac{1}{3}-\left(\dfrac{2}{3}-x+\dfrac{5}{4}\right)=\dfrac{7}{12}-\left(\dfrac{5}{2}-\dfrac{13}{6}\right)\)
tìm x :
a) \(\dfrac{x+1}{7}+\dfrac{x+1}{8}=\dfrac{x+1}{9}+\dfrac{x+1}{10}\)
b) \(\dfrac{x+1}{12}+\dfrac{x^2}{11}=\dfrac{x+3}{10}+\dfrac{x+4}{9}\)
c) \(\dfrac{x-2}{x-1}=\dfrac{x+4}{x+7}\)
d)\(\dfrac{3x+2}{5x+7}=\dfrac{3x-1}{5x-3}\)
2 tìm x,y,z
a) \(\dfrac{x}{2}=\dfrac{y}{3},\dfrac{y}{4}=\dfrac{z}{5}vàx^2-y^2=-16\)
b)2x=3y,5x=7z và 3x-7y+5z=30
1. Tìm tỉ số \(\dfrac{x}{y}\) biết \(\dfrac{2x-y}{x+y}\)=\(\dfrac{2}{3}\)
2. Tìm x:
a) 3,8 : (2x) = \(\dfrac{1}{4}:2\dfrac{2}{3}\)
b) \(1\dfrac{1}{3}\) : 0,8 = \(\dfrac{2}{3}\) : (0,1x)
c) \(\dfrac{x}{-15}\) = \(\dfrac{-60}{x}\)
d) \(\dfrac{-2}{x}=\dfrac{-x}{\dfrac{8}{25}}\)
e) 0,2 : \(1\dfrac{1}{5}\)= \(\dfrac{2}{3}\) : (6x+7)
3. Tính A = \(\dfrac{8^{10}+4^{10}}{8^4+4^{11}}\)
Câu 3.
Câu 4. (\(\dfrac{4}{9}\)) \(^5\) . (\(\dfrac{3}{7}\))\(^{10}\) viết dưới dạng lũy thừa là?
Câu 5. \(\dfrac{x}{5}\) = \(\dfrac{y}{3}\) và x-y = 2. Giá trị x + y =?
Câu 6. x\(^2\) = 2. Số các giá trị của x thỏa mãn là?
Câu 7.
1. Tìm x biết :
a) \(\dfrac{x+4}{2001}+\dfrac{x+3}{2002}=\dfrac{x+2}{2003}+\dfrac{x+1}{2004}\)
b)\(\dfrac{x+2016}{11}+\dfrac{x+2017}{12}=\dfrac{x+2010}{5}\dfrac{x+2015}{10}\)
c)\(\dfrac{x+3}{5}+\dfrac{x+4}{4}+\dfrac{x+5}{3}+\dfrac{x+12}{2}=-1\)
d) (x-7)(x-6)=0
e)\(^{x^{ }2=4x}\)
f) (x-8)(x+2) đạt giá trị âm
g) \(\dfrac{x-2}{x-4}đạtgiatridương\)
Tìm số hữu tỉ x, biết rằng:
a. \(\dfrac{x+1}{10}+\dfrac{x+1}{11}+\dfrac{x+1}{12}=\dfrac{x+1}{13}+\dfrac{x+1}{14}\)
b. \(\dfrac{x+4}{2000}+\dfrac{x+3}{2001}=\dfrac{x+2}{2002}+\dfrac{x+1}{2003}\)
Tìm x và y biết:
a) \(\dfrac{2x}{3y}=\dfrac{-1}{3}\)và -2x+3y=7
b)\(\dfrac{x}{3}=\dfrac{y}{4}\)và 2x+5y=10
c) 7x=3y và x-y=16
d)\(\dfrac{x}{5}=\dfrac{y}{1}=\dfrac{z}{-2}\)và x+y-2z=160
e)\(\dfrac{x}{10}=\dfrac{y}{5};\dfrac{y}{2}=\dfrac{z}{3}\)và 2x-3y+4z=330
f) \(\dfrac{x}{-2}=\dfrac{-y}{4}=\dfrac{z}{5}\)và x-2y+3z=1200
g) \(\dfrac{x}{3}=\dfrac{y}{8}=\dfrac{z}{5}\)và 2x+3y-z=50
Tìm x
1) \(\left(\dfrac{1}{16}\right)^x=\left(\dfrac{1}{8}\right)^6\) 2) \(\left(\dfrac{1}{16}\right)^x=\left(\dfrac{1}{8}\right)^{36}\) 3) \(\left(\dfrac{1}{81}\right)^x=\left(\dfrac{1}{27}\right)^4\)
4) \(\left(\dfrac{4}{9}\right)^x=\left(\dfrac{8}{27}\right)^{10}\) 5) \(2^x=4^5.4^3\) help me !!!!