\(\Leftrightarrow x^2-10x+21=x^2+3x-10\)
=>-13x=-31
hay x=31/13
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Tìm x, biết:
a) dfrac{3}{7}x - dfrac{2}{3}x dfrac{10}{21}
b) dfrac{7}{35} : (x - dfrac{1}{3}) -dfrac{2}{25}
c) 3.(x - dfrac{1}{2}) - 5. (x + dfrac{3}{5}) -x + dfrac{1}{5}
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Tìm x, biết:
a) \(\dfrac{3}{7}\)x - \(\dfrac{2}{3}\)x = \(\dfrac{10}{21}\)
b) \(\dfrac{7}{35}\) : (x - \(\dfrac{1}{3}\)) = \(-\dfrac{2}{25}\)
c) 3.(x - \(\dfrac{1}{2}\)) - 5. (x + \(\dfrac{3}{5}\)) = -x + \(\dfrac{1}{5}\)
Tìm x, biếta)dfrac{1}{2}xx-dfrac{7}{3}dfrac{-5}{6}+dfrac{3}{4}xxb)dfrac{4}{5}xx-dfrac{6}{5}dfrac{1}{2}+dfrac{3}{2}xxc)dfrac{2}{5}x(3xx+dfrac{3}{4})1dfrac{1}{5}-dfrac{1}{3}xxd)2x(3xx
+dfrac{3}{4})+dfrac{4}{5}dfrac{1}{2}-2xx
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Tìm x, biết
a)\(\dfrac{1}{2}\)x\(x\)-\(\dfrac{7}{3}\)=\(\dfrac{-5}{6}\)+\(\dfrac{3}{4}\)x\(x\)
b)\(\dfrac{4}{5}\)x\(x\)-\(\dfrac{6}{5}\)=\(\dfrac{1}{2}\)+\(\dfrac{3}{2}\)x\(x\)
c)\(\dfrac{2}{5}\)x(3x\(x\)+\(\dfrac{3}{4}\))=\(1\dfrac{1}{5}\)-\(\dfrac{1}{3}\)x\(x\)
d)2x(3x\(x \)+\(\dfrac{3}{4}\))+\(\dfrac{4}{5}\)=\(\dfrac{1}{2}\)-2x\(x\)
Tìm x, biết:
a) dfrac{-1}{10} + dfrac{2}{5}x + dfrac{7}{20} dfrac{1}{10}
b) dfrac{1}{3} + dfrac{1}{2} : x -dfrac{1}{5}
c) -dfrac{2}{3} : x + dfrac{5}{8} -dfrac{7}{12}
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Tìm x, biết:
a) \(\dfrac{-1}{10}\) + \(\dfrac{2}{5}\)x + \(\dfrac{7}{20}\) = \(\dfrac{1}{10}\)
b) \(\dfrac{1}{3}\) + \(\dfrac{1}{2}\) : x= \(-\dfrac{1}{5}\)
c) \(-\dfrac{2}{3}\) : x + \(\dfrac{5}{8}\) = \(-\dfrac{7}{12}\)
a) 2dfrac{1}{2} - x + dfrac{4}{5} dfrac{2}{3} - (-dfrac{4}{7} )
b) -dfrac{4}{7} - x dfrac{3}{5} - 2x
c) (dfrac{3}{8} - dfrac{1}{5} ) + (dfrac{5}{8} - x) dfrac{1}{5}
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a) \(2\dfrac{1}{2}\) - x + \(\dfrac{4}{5}\) = \(\dfrac{2}{3}\) - (\(-\dfrac{4}{7}\) )
b) \(-\dfrac{4}{7}\) - x = \(\dfrac{3}{5}\) - 2x
c) (\(\dfrac{3}{8}\) - \(\dfrac{1}{5}\) ) + (\(\dfrac{5}{8}\) - x) = \(\dfrac{1}{5}\)
Tìm x, biết:
a) dfrac{1}{20} - (x - dfrac{8}{5}) dfrac{1}{10}
b) dfrac{7}{4} - (x + dfrac{5}{3}) dfrac{-12}{5}
c) x - [dfrac{17}{2} - left(dfrac{-3}{7}+dfrac{5}{3}right)] dfrac{-1}{3}
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Tìm x, biết:
a) \(\dfrac{1}{20}\) - (x - \(\dfrac{8}{5}\)) = \(\dfrac{1}{10}\)
b) \(\dfrac{7}{4}\) - (x + \(\dfrac{5}{3}\)) = \(\dfrac{-12}{5}\)
c) x - [\(\dfrac{17}{2}\) - \(\left(\dfrac{-3}{7}+\dfrac{5}{3}\right)\)] = \(\dfrac{-1}{3}\)
\(b,\dfrac{x}{2}-\left(\dfrac{3x}{5}-\dfrac{13}{5}\right)=-\left(\dfrac{7}{5}+\dfrac{7}{10}.x\right)\)
\(c,\dfrac{2x-3}{3}+\dfrac{-3}{2}=\dfrac{5-3x}{6}-\dfrac{1}{3}\)
\(d,\dfrac{2}{3x}-\dfrac{3}{12}=\dfrac{4}{5}-\left(\dfrac{7}{x}-2\right)\)
\(e,2\left(x-1\right)=\left(x-1\right)^2\)
Tìm x :
a, dfrac{11}{12} - (dfrac{2}{5} +x) dfrac{2}{3} b, x+dfrac{2}{3} dfrac{3}{5} - dfrac{-1}{6} c, x-[dfrac{17}{2} -(dfrac{-3}{7} + dfrac{5}{3} )]dfrac{-1}{3}
d,dfrac{9}{2} - [dfrac{2}{3} - (x+dfrac{7}{4} )] dfrac{-5}{4}
Mọi người giúp mình nha
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Tìm x :
a, \(\dfrac{11}{12}\) - (\(\dfrac{2}{5}\) +x) = \(\dfrac{2}{3}\) b, x+\(\dfrac{2}{3}\) =\(\dfrac{3}{5}\) - \(\dfrac{-1}{6}\) c, x-[\(\dfrac{17}{2}\) -(\(\dfrac{-3}{7}\) + \(\dfrac{5}{3}\) )]=\(\dfrac{-1}{3}\)
d,\(\dfrac{9}{2}\) - [\(\dfrac{2}{3}\) - (x+\(\dfrac{7}{4}\) )] =\(\dfrac{-5}{4}\)
Mọi người giúp mình nha
\(\dfrac{x-3}{5-x}\)=\(\dfrac{5}{7}\)
\(\dfrac{|x-2|}{2}\)=\(\dfrac{|2x+3|}{3}\)
tìm x thuộc Q
Tìm x:
a) dfrac{11}{12} - (dfrac{2}{5} + dfrac{3}{4}x) dfrac{2}{3}
b) dfrac{-2}{5} + dfrac{5}{3} . (dfrac{3}{2} - dfrac{4}{15}x) dfrac{-7}{6}
c) dfrac{1}{2} + dfrac{3}{4}x dfrac{1}{4}
Đọc tiếp
Tìm x:
a) \(\dfrac{11}{12}\) - (\(\dfrac{2}{5}\) + \(\dfrac{3}{4}\)x) \(\dfrac{2}{3}\)
b) \(\dfrac{-2}{5}\) + \(\dfrac{5}{3}\) . (\(\dfrac{3}{2}\) - \(\dfrac{4}{15}\)x) = \(\dfrac{-7}{6}\)
c) \(\dfrac{1}{2}\) + \(\dfrac{3}{4}\)x = \(\dfrac{1}{4}\)
Tìm x, biết:
a) \(\dfrac{2}{3}\)x - \(\dfrac{1}{2}\)x = \(\left(-\dfrac{7}{12}\right)\) . \(1\dfrac{2}{5}\)
b) \(\left(\dfrac{1}{5}-\dfrac{3}{2}x\right)^2\) = \(\dfrac{9}{4}\)
c) (1,25 - \(\dfrac{4}{5}\)x)3 = -125