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Tính :Pfrac{frac{1}{2003}+frac{1}{2004}-frac{1}{2005}}{frac{5}{2003}+frac{5}{2004}-frac{5}{2005}}-frac{frac{2}{2002}+frac{2}{2003}-frac{2}{2004}}{frac{3}{2002}+frac{3}{2003}-frac{3}{2004}} Qleft(frac{1,5+1-0,75}{2,5+frac{5}{3}-1,25}right)+frac{0,375-0,3+frac{3}{11}+frac{3}{12}}{-0,625+0,5-frac{5}{11}-frac{3}{12}}:frac{1890}{2005}+115Giúp mình với mình đang cần gấp, thanks các bạn nhìu
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Tính :
P=\(\frac{\frac{1}{2003}+\frac{1}{2004}-\frac{1}{2005}}{\frac{5}{2003}+\frac{5}{2004}-\frac{5}{2005}}-\frac{\frac{2}{2002}+\frac{2}{2003}-\frac{2}{2004}}{\frac{3}{2002}+\frac{3}{2003}-\frac{3}{2004}}\)
Q=\(\left(\frac{1,5+1-0,75}{2,5+\frac{5}{3}-1,25}\right)+\frac{0,375-0,3+\frac{3}{11}+\frac{3}{12}}{-0,625+0,5-\frac{5}{11}-\frac{3}{12}}:\frac{1890}{2005}+115\)
Giúp mình với mình đang cần gấp, thanks các bạn nhìu
Tính
\(\frac{1}{3}+\frac{1}{3^2}+\frac{1}{3^3}+....+\frac{1}{3^{2004}}+\frac{1}{3^{2005}}\)
1, tính :
\(\left(\frac{1}{2}-1\right).\left(\frac{1}{3}-1\right)..........\left(\frac{1}{2004}-1\right)\left(\frac{1}{2005}-1\right)\)
2, tìm x \(\frac{4x}{2x-\frac{1}{5}}>0\)
CMR : E = \(1-\frac{1}{2^2}-\frac{1}{3^2}-...-\frac{1}{2004^2}>\frac{1}{2004}\)
F = \(\frac{1}{2^2}+\frac{1}{4^2}+...+\frac{1}{200^2}< \frac{1}{2}\)
H = \(\frac{1}{3}+\frac{2}{3^2}+\frac{3}{3^3}+...+\frac{100}{3^{100}}< \frac{3}{4}\)
tính số hữu tỉ \(\frac{A}{B}biết:A=\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...\frac{1}{2007}+\frac{1}{2008}+\frac{1}{2009}B=\frac{2008}{1}+\frac{2007}{1}+\frac{2006}{1}+...+\frac{2}{2007}+\frac{1}{2008}.\)
Tìm x,y,z khi:
a)\(\frac{x}{7}=\frac{y}{3}\)và x-24=y
b)\(\frac{x-1}{2005}=\frac{3-y}{2006}\)và x-y=4009
Tính :
\(D=\frac{\left(\frac{3}{10}-\frac{4}{5}-\frac{7}{20}\right).\frac{-5}{19}}{\left(\frac{1}{14}+\frac{1}{7}-\frac{-3}{35}\right).\frac{4}{3}}\)
\(E=\frac{1-\frac{1}{3}+\frac{1}{1+\frac{1}{3}}}{1-\frac{1}{3}-\frac{1}{1\frac{1}{3}}}\)
\(G=1-\frac{1}{1-\frac{2}{1-\frac{3}{1-\frac{1}{4}}}}\)
2 Thực hiện phép tínhfrac{17}{9}-frac{17}{9}:left(frac{7}{3}+frac{1}{2}right)frac{4}{3}.frac{2}{5}-frac{3}{4}.frac{2}{5}-frac{3}{4}.5frac{3}{13}-0.75.frac{36}{13}3.left(-frac{4}{3}right)^2-frac{7}{3}-frac{5}{7}.frac{3}{11}+frac{-5}{7}.frac{8}{11}+3frac{5}{7}32frac{1}{7}:left(frac{-5}{4}right)-47frac{1}{7}:left(frac{-5}{4}right)left(frac{2}{3}+frac{1}{2}right)^2-frac{1}{12} frac{1}{4}-frac{5}{12}:frac{1}{6}+frac{-6}{5} frac{17}{21}+frac{5}{23}-frac{1}{2}+frac{4}{21}-1frac{5}{23}left(-3right)^2+sq...
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2 Thực hiện phép tính
\(\frac{17}{9}-\frac{17}{9}:\left(\frac{7}{3}+\frac{1}{2}\right)\)
\(\frac{4}{3}.\frac{2}{5}-\frac{3}{4}.\frac{2}{5}\)
\(-\frac{3}{4}.5\frac{3}{13}-0.75.\frac{36}{13}\)
\(3.\left(-\frac{4}{3}\right)^2-\frac{7}{3}\)
\(-\frac{5}{7}.\frac{3}{11}+\frac{-5}{7}.\frac{8}{11}+3\frac{5}{7}\)
\(32\frac{1}{7}:\left(\frac{-5}{4}\right)-47\frac{1}{7}:\left(\frac{-5}{4}\right)\)
\(\left(\frac{2}{3}+\frac{1}{2}\right)^2-\frac{1}{12}\\ \frac{1}{4}-\frac{5}{12}:\frac{1}{6}+\frac{-6}{5}\\ \frac{17}{21}+\frac{5}{23}-\frac{1}{2}+\frac{4}{21}-1\frac{5}{23}\)
\(\left(-3\right)^2+\sqrt{\frac{16}{25}}-\sqrt{9}+\frac{\sqrt{81}}{3}\)
Tìm x,y,z khi :
a, \(\frac{x}{2}=\frac{y}{3}\) , \(\frac{y}{4}=\frac{z}{5}\) và x - y- z= 28
b, \(\frac{4-z}{1}=\frac{y+z}{2}=\frac{x+y}{3}=\frac{y+8}{5}\)
c, \(\left(x-\frac{1}{5}\right)^{2004}+\left(y+0.4\right)^{100}+\left(z-3\right)^{678}=0\)