Đổi hết ra phân số nhé
Ta dc:\(\left(\left(\frac{33}{5}\right)-8.\frac{1}{8}+\frac{2}{15}.\frac{3}{10}\right).\frac{3}{14}\)
\(=\left(\left(\frac{33}{5}\right)-1+\frac{1}{25}\right).\frac{3}{14}\)
\(=\frac{141}{25}.\frac{3}{14}=\frac{423}{350}\)
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:\(720:[41-\left(2\cdot x-5\right)]=120\)
Tính
\(\left(\frac{1}{3}+\frac{5}{6}\right)\cdot11-7\)
\(\frac{-5}{11}\cdot\frac{7}{15}\cdot\frac{11}{-5}\cdot\left(-30\right)\)
\(\left(1:2\frac{1}{3}+\frac{5}{14}\right):2\frac{1}{5}\) \(\frac{1}{2003}\cdot\left(1-\frac{1}{2004}\right)\cdot\left(1-\frac{1}{2006}\left(1-\frac{1}{2006}\right)\right)\cdot\)
a)\(\frac{11}{9}+\frac{7}{6}\cdot\left(2-\frac{1}{3}\right)\)
b)\(1\frac{1}{21}:\left(15,75-15\frac{1}{4}\right)+2\frac{1}{12}:\left(7\frac{3}{4}-7,25\right)\)
\(\frac{19}{2}+\frac{6}{8}\cdot\frac{2}{3}:\left(1-\frac{3}{2}\right)\)
Bài 1:
\(a,\left(x-\frac{1}{2}\right)\cdot\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+......+\frac{1}{90}\right)=\frac{1}{3}\)
\(b,\frac{1}{1\cdot6}+\frac{1}{6\cdot11}+.....+\frac{1}{96\cdot101}=\frac{1}{10\cdot x}\)
\(c,460+85\cdot4=\frac{x+175}{5}+30\)
\(d,\left(x-5\right)\cdot\left(10-9\frac{40}{41}\right):\left(1-\frac{81}{82}\right):\left(1-\frac{204}{205}\right)=2050\)
\(1+\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+\frac{1}{15}+.........+\frac{1}{x\cdot\left(x+1\right):2}=1\frac{1933}{1935}\)
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 nhanh
\(14:\left(4\frac{2}{3}-1\frac{5}{9}\right)+14\left(\frac{2}{3}+\frac{8}{9}\right)\)
