\(\frac{1}{3}+\frac{1}{3}+\frac{1}{3}+\frac{1}{5}+\frac{1}{5}+\frac{1}{5}\)
\(=\frac{1}{3}\times3+\frac{1}{5}\times3\)
\(=1+\frac{3}{5}\)
\(=\frac{8}{5}.\)
1/3+1/3+1/3+1/5+1/5+1/5=1+3/5=5/5+3/5=8/5
Tính nhanh:\(\frac{1}{2}\times\frac{1}{2}+\frac{1}{2}\times\frac{1}{3}+\frac{1}{3}\times\frac{1}{4}+\frac{1}{4}\times\frac{1}{5}+\frac{1}{5}\times\frac{1}{6}\)
tính nhanh
a)\(\frac{2}{3}:\frac{5}{7}\cdot\frac{5}{7}:\frac{2}{3}+1934\)
b) \(\frac{1}{5}:\frac{1}{3}\cdot\frac{1:3}{1:5}+1996\)
tính nhanh hộ mình câu này với : (có kèm bài làm nha )
\(\frac{3}{2}+\frac{ 3}{8}+\frac{3}{32}+\frac{3}{128}+\frac{3}{512}\)
\(5+\frac{5}{3}+\frac{5}{9}+\frac{5}{27}+\frac{5}{81}\)
\(\frac{4}{3}+\frac{1}{3}+\frac{1}{12}+\frac{1}{48}+\frac{1}{192}\)
Tính nhanh : \(\frac{1}{2}x\frac{1}{2}+\frac{1}{2}x\frac{1}{3}+\frac{1}{3}x\frac{1}{4}+\frac{1}{4}x\frac{1}{5}+\frac{1}{5}x\frac{1}{6}\)
tính nhanh: G= \(3\frac{5}{7}+4\frac{3}{5}+1\frac{2}{7}+3\frac{1}{5}-\frac{4}{5}\)
Tính nhanh
\(4\frac{2}{5}+5\frac{6}{9}+2\frac{3}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\)
Tính nhanh
\(\frac{2014+\frac{2013}{2}+\frac{2012}{3}+\frac{2011}{4}+\frac{2010}{5}+...+\frac{2}{2013}+\frac{1}{2014}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{2012}+\frac{1}{2013}+\frac{1}{2014}}\)
Giải tự luận hộ mình nha!!!!!!!! Mình cảm ơn!!!
Tính tổng A theo cách nhanh nhất :
A = 5 + \(\frac{5}{1+2}+\frac{5}{1+2+3}+\frac{5}{1+2+3+4}+.....+\frac{5}{1+2+3+...+100}\)
tính nhanh :
\(4\frac{2}{5}+5\frac{6}{9}+2\frac{3}{4}+\frac{3}{5}+\)\(\frac{1}{3}+\frac{1}{4}\)
