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Bài 1:a,left(x-frac{1}{2}right)cdotleft(frac{1}{2}+frac{1}{6}+frac{1}{12}+frac{1}{20}+......+frac{1}{90}right)frac{1}{3}b,frac{1}{1cdot6}+frac{1}{6cdot11}+.....+frac{1}{96cdot101}frac{1}{10cdot x}c,460+85cdot4frac{x+175}{5}+30d,left(x-5right)cdotleft(10-9frac{40}{41}right):left(1-frac{81}{82}right):left(1-frac{204}{205}right)2050
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Bài 1:
\(a,\left(x-\frac{1}{2}\right)\cdot\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+......+\frac{1}{90}\right)=\frac{1}{3}\)
\(b,\frac{1}{1\cdot6}+\frac{1}{6\cdot11}+.....+\frac{1}{96\cdot101}=\frac{1}{10\cdot x}\)
\(c,460+85\cdot4=\frac{x+175}{5}+30\)
\(d,\left(x-5\right)\cdot\left(10-9\frac{40}{41}\right):\left(1-\frac{81}{82}\right):\left(1-\frac{204}{205}\right)=2050\)
Tính nhanh:
\(\frac{9,1+10,2+...+17,9+19}{\left(1-\frac{2}{42}\right)\cdot\left(1-\frac{2}{56}\right)\cdot...\cdot\left(1-\frac{2}{2550}\right)\cdot\left(1-\frac{2}{2652}\right)}\cdot\frac{265}{357}\)
Làm nhanh cho mình trước 14h30p 30/7/2016
Ai làm được cho 5 lần tick
1,Tính nhanh
a,3x\(\left(\frac{1}{7}+\frac{1}{3}-\frac{3}{14}\right):\frac{11}{14}\)
b,\(\left(\frac{21}{8}+\frac{1}{2}\right):\frac{5}{6}\)
3,Tìm x,biết
a,\(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+......+\frac{2}{x\cdot\left(x+1\right)}=\frac{2016}{2018}\)
b,720:\(720:[41-\left(2\cdot x-5\right)]=120\)
a)\(\frac{11}{9}+\frac{7}{6}\cdot\left(2-\frac{1}{3}\right)\)
b)\(1\frac{1}{21}:\left(15,75-15\frac{1}{4}\right)+2\frac{1}{12}:\left(7\frac{3}{4}-7,25\right)\)
bài 1
\(\frac{18}{11}+\left(\frac{7}{4}-\frac{3}{5}\right):\frac{1}{2}\)
\(\frac{8}{5}-\frac{1}{2}:\frac{1}{4}\cdot\left(\frac{3}{7}+\frac{1}{4}\right)\)
\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}\)
Tính giá trị biểu thức:
\(\frac{6:\frac{3}{5}-1\frac{1}{6}\cdot\frac{6}{7}}{4\frac{1}{5}\cdot\frac{10}{11}+5\frac{2}{11}}\)
\(\left(1-\frac{1}{2}\right)\cdot\left(1-\frac{1}{3}\right)\cdot.....\cdot\left(1-\frac{1}{7}\right)=?\)
\(\left(1-\frac{1}{4}\right)\left(1-\frac{1}{9}\right)\left(1-\frac{1}{16}\right)\cdot....\cdot\left(1-\frac{1}{256}\right)\cdot x=\frac{108}{7}\)
Tính giá trị biểu thức :
\(\frac{6:\frac{3}{5}-1\frac{1}{6}\cdot\frac{6}{7}}{4\frac{1}{5}\cdot\frac{10}{11}+5\frac{2}{11}}\)