Sửa đề; \(\dfrac{x-342}{15}+\dfrac{x-323}{17}+\dfrac{x-300}{19}+\dfrac{x-273}{21}=10\)
\(\Leftrightarrow x-357=0\)
hay x=357
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Tìm x: \(\frac{x-241}{17}+\frac{x-220}{19}+\frac{x-195}{21}+\frac{x-166}{23}=10\)
8 tháng 9 2016 lúc 12:40
Tìm x biết:
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c)(x-2)2=\(\frac{38}{25}+\frac{9}{10}-\frac{11}{15}+\frac{13}{21}-\frac{15}{28}+\frac{17}{36}-...+\frac{197}{4851}-\frac{199}{4950}\)
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tìm x ,biết:
a)\(\frac{2}{\left(x+2\right).\left(x+4\right)}+\frac{4}{\left(x+4\right).\left(x+8\right)}+\frac{6}{\left(x+8\right).\left(x+14\right)}=\frac{x}{\left(x+2\right).\left(x+14\right)}\)
b)\(\frac{x+1}{10}+\frac{x+1}{11}+\frac{x+1}{12}=\frac{x+1}{13}+\frac{x+1}{14}\)
c)\(\left(x-2\right)^2=\frac{38}{25}+\frac{9}{10}-\frac{11}{15}+\frac{13}{21}-\frac{15}{28}+\frac{17}{36}-..+\frac{197}{1851}-\frac{199}{1950}\)
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b) \(\frac{x^2}{9}=\frac{y^2}{16}\) và x2+y2=100
tìm x , y , z biết :
a) \(\frac{15}{x-9}=\frac{20}{y-12}=\frac{40}{z-24}\) và x.y = 1200
b) \(\frac{40}{x-30}=\frac{20}{y-50}=\frac{28}{z-21}\) và x.y.z = 22400
c) 15x = -10y = 6z và x.y.z = 30000
1. Tìm x ϵ Q sao cho:a) (2x-3). (x+1) 0.b) left(x-frac{1}{2}right).left(x+3right) 0.2. Tính:Sfrac{1}{3.5}+frac{1}{5.7}+...+frac{1}{999.1001}3. Tìm x: Biết x không thuộc{-2; -5; -10; -17}frac{3}{left(x+2right).left(x+5right)}+frac{5}{left(x+5right).left(x+10right)}+frac{7}{left(x+10right).left(x+17right)}frac{x}{left(x+2right).left(x+17right)}
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1. Tìm x ϵ Q sao cho:
a) (2x-3). (x+1) < 0.
b) \(\left(x-\frac{1}{2}\right).\left(x+3\right)\)> 0.
2. Tính:
S=\(\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{999.1001}\)
3. Tìm x: Biết x không thuộc{-2; -5; -10; -17}
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Tìm x biết
\(\left(\frac{1}{21}+\frac{1}{77}+\frac{1}{165}+\frac{2}{19.30}+\frac{2}{19.34}\right).x=\frac{3}{276}\)
Tìm x biết:
a) \(\frac{x}{-15}=\frac{-60}{x}\)
b) \(\frac{-2}{x}=\frac{-x}{\frac{8}{25}}\)