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Tìm x:
a)2016x+left(dfrac{7}{12}+dfrac{4}{21}+dfrac{2}{24}+dfrac{11}{30}+dfrac{3}{40}+dfrac{15}{56}right)-left(dfrac{2}{3}+dfrac{2}{4}+dfrac{2}{5}right)0
bdfrac{2x-1}{x+2015}-dfrac{4025}{x+2017}dfrac{x-2014}{2x-4036}-dfrac{x-2013}{2x-4030} (x thuộc N)
c)left(1+dfrac{1}{1.3}right)left(1+dfrac{1}{2.4}right)left(1+dfrac{1}{3.5}right)...left(1+dfrac{1}{xleft(x+2right)}right)dfrac{4016}{2007}
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Tìm x:
a)\(2016x+\left(\dfrac{7}{12}+\dfrac{4}{21}+\dfrac{2}{24}+\dfrac{11}{30}+\dfrac{3}{40}+\dfrac{15}{56}\right)-\left(\dfrac{2}{3}+\dfrac{2}{4}+\dfrac{2}{5}\right)=0\)
b\(\dfrac{2x-1}{x+2015}-\dfrac{4025}{x+2017}=\dfrac{x-2014}{2x-4036}-\dfrac{x-2013}{2x-4030}\) (x thuộc N)
c)\(\left(1+\dfrac{1}{1.3}\right)\left(1+\dfrac{1}{2.4}\right)\left(1+\dfrac{1}{3.5}\right)...\left(1+\dfrac{1}{x\left(x+2\right)}\right)=\dfrac{4016}{2007}\)
AI GIÚP MK VỚI MK TICK CHO 
tìm x biết:
\(\dfrac{2x-1}{x+2015}-\dfrac{4023}{x+2017}=\dfrac{x-2014}{2x-4036}-\dfrac{x-2013}{2x-4038}\) \(x\in n\)
Tìm x \(\in\) Z biết:
1) \(\dfrac{1-x}{2017}+\dfrac{2-x}{2016}=\dfrac{3-x}{2015}+\dfrac{4-x}{2014}\)
BT1: Tìm x \(\in\) Z biết:
1) \(\dfrac{1-x}{2017}+\dfrac{2-x}{2016}=\dfrac{3-x}{2015}+\dfrac{4-x}{2014}\)
Bài 1: Tính hợp lý:
a. 1152 - (374 + 1152) + (374 - 65)
b. dfrac{7}{12} + dfrac{5}{6} + dfrac{1}{4} - dfrac{3}{7} - dfrac{5}{12}
c. dfrac{11.3^{22}.3^7-9^{15}}{left(2.3^{14}right)^2}
d, dfrac{3}{2^2} . dfrac{8}{3^2} . dfrac{15}{4^2} ... dfrac{899}{30^2}
Bài 2: Tìm x biết:
a, 2x + 2x+1 + 2x+2 + 2 x+3 480
b, left(dfrac{1}{2}+dfrac{1}{3}+...+dfrac{1}{2012}+dfrac{1}{2013}right) . x dfrac{2012}{1}+dfrac{2011}{2}+dfrac{2010}{3}+...+dfrac{2}{2011}+dfrac{1}{2012}.
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Bài 1: Tính hợp lý:
a. 1152 - (374 + 1152) + (374 - 65)
b. \(\dfrac{7}{12}\) + \(\dfrac{5}{6}\) + \(\dfrac{1}{4}\) - \(\dfrac{3}{7}\) - \(\dfrac{5}{12}\)
c. \(\dfrac{11.3^{22}.3^7-9^{15}}{\left(2.3^{14}\right)^2}\)
d, \(\dfrac{3}{2^2}\) . \(\dfrac{8}{3^2}\) . \(\dfrac{15}{4^2}\) ... \(\dfrac{899}{30^2}\)
Bài 2: Tìm x biết:
a, 2x + 2x+1 + 2x+2 + 2 x+3 = 480
b, \(\left(\dfrac{1}{2}+\dfrac{1}{3}+...+\dfrac{1}{2012}+\dfrac{1}{2013}\right)\) . x = \(\dfrac{2012}{1}+\dfrac{2011}{2}+\dfrac{2010}{3}+...+\dfrac{2}{2011}+\dfrac{1}{2012}.\)
Tìm x, y \(\in\) Z, biết:
a. xy - x + 2y = 3
b. \(\dfrac{1}{x}+\dfrac{1}{y}=\dfrac{1}{2}\)
bài 1 tìm x,y,z
a, dfrac{x}{10}dfrac{y}{15},xdfrac{7}{2} và x +2y-3z20
b,2x3y,4957 và 4x-3y+5z7
c, dfrac{2x}{3}dfrac{3y}{4}dfrac{47}{5} và x+y+z49
bài 2 tìm x trong tỉ lệ thức sau
a, dfrac{x-3}{x+5}dfrac{5}{7}
b,dfrac{7}{x-1} dfrac{x+1}{9}
c,dfrac{x+4}{20}dfrac{2}{x+4}
d,dfrac{x-1}{x+2}dfrac{x-2}{x+3}
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bài 1 tìm x,y,z
a, \(\dfrac{x}{10}\)=\(\dfrac{y}{15}\),x=\(\dfrac{7}{2}\) và x +2y-3z=20
b,2x=3y,49=57 và 4x-3y+5z=7
c, \(\dfrac{2x}{3}\)=\(\dfrac{3y}{4}\)=\(\dfrac{47}{5}\) và x+y+z=49
bài 2 tìm x trong tỉ lệ thức sau
a, \(\dfrac{x-3}{x+5}=\dfrac{5}{7}\)
b,\(\dfrac{7}{x-1}\) =\(\dfrac{x+1}{9}\)
c,\(\dfrac{x+4}{20}=\dfrac{2}{x+4}\)
d,\(\dfrac{x-1}{x+2}=\dfrac{x-2}{x+3}\)
Tìm x biết:
a) \(\dfrac{x+5}{3}\)=\(\dfrac{x-6}{7}\)
b) x - \(\dfrac{20}{11.13}\)-\(\dfrac{20}{13.15}\)-\(\dfrac{20}{15.17}\)-...-\(\dfrac{20}{53.55}\)=\(\dfrac{3}{11}\)
\(\dfrac{1}{3}\)+\(\dfrac{1}{6}\)+\(\dfrac{1}{10}\)+...+\(\dfrac{2}{n\left(n+1\right)}\)=\(\dfrac{2015}{2016}\)
Tìm x:
a,dfrac{x-1}{x+1}dfrac{x-2}{x+3}
b,dfrac{1}{x+1}+dfrac{1}{x-1}dfrac{1}{x+2}+dfrac{1}{x-2}
c,dfrac{x+1}{x+2}+dfrac{x+2}{x+3}dfrac{x+3}{x+4}+dfrac{x+4}{x+5}
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Tìm x:
a,\(\dfrac{x-1}{x+1}=\dfrac{x-2}{x+3}\)
b,\(\dfrac{1}{x+1}+\dfrac{1}{x-1}=\dfrac{1}{x+2}+\dfrac{1}{x-2}\)
c,\(\dfrac{x+1}{x+2}+\dfrac{x+2}{x+3}=\dfrac{x+3}{x+4}+\dfrac{x+4}{x+5}\)
Mn giúp mk vs ạ!
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