\(\frac{3}{4}+\frac{1}{4}=\frac{4}{4}=1\)
\(\frac{3}{4}+\frac{1}{4}=\frac{3+1}{4}=\frac{4}{4}=1\)
h nha mk h lại liền
\(\frac{1}{2}-\frac{1}{3}-\frac{2}{3}+\frac{1}{4}+\frac{2}{4}+\frac{3}{4}-\frac{1}{5}-\frac{2}{5}-\frac{3}{5}-\frac{4}{5}+...+\frac{1}{10}+\frac{2}{10}+\frac{3}{10}+...+\frac{9}{10}\)\(+\)\(\frac{9}{10}\)
Tính nhanh bài toán sau
\(\left(\frac{19}{20}x\frac{3}{4}+\frac{1}{20}x\frac{3}{4}\right)x\left(\frac{1}{2}x\frac{3}{4}-\frac{2}{4}x\frac{3}{4}\right)\)
B1:Tính
a)\(3\frac{4}{7}x2\frac{4}{5}\)
b)\(\frac{4}{5}:\frac{1}{2}+\frac{17}{3}\)
c)\(5\frac{1}{3}-2\frac{1}{6}\)
d)\(4\frac{1}{2}:2\frac{1}{4}\)
tính nhanh \(\frac{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{100}}{\frac{1}{2}+\frac{2}{3}+\frac{3}{4}+....+\frac{99}{100}}\)
\(\frac{75}{100}+\frac{18}{21}+\frac{19}{23}+\frac{1}{4}+\frac{3}{21}+\frac{13}{32}=\)
\(4\frac{2}{5}+5\frac{6}{9}+2\frac{3}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\)
\(\frac{2}{3\cdot5}+\frac{2}{5\cdot7}+\frac{2}{7\cdot9}+.....+\frac{2}{41\cdot43}\)
\(\frac{1}{1×2}+\frac{1}{2×3}\: +\frac{1}{3×4}\: +\frac{1}{4×5}+\frac{1}{5×6}\: +\frac{1}{6×7}+\frac{1}{7×8}+\frac{1}{8×9}\: =?\)
Tính
\(\frac{1}{2}\times\left(\frac{3}{4}+\frac{8}{9}-\frac{1}{2}\right)=\)
\(\frac{3}{4}:\frac{4}{5}+\left(\frac{3}{4}\times2\right)\)=
ai nhanh mk k
\(\frac{1}{2}\times\frac{2}{3}+\frac{1}{3}\times\frac{3}{4}+\frac{1}{4}\times5=?\)
Bài 1:Tính nhanh:
a,\(\frac{2}{3}+\frac{4}{6}+\frac{6}{3}\)
b,\(\frac{3}{4}+\frac{6}{8}+\frac{18}{12}\)
Bài 2:Tính:
a,\(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\)
b,\(\frac{1}{2}+\frac{1}{3}+\frac{1}{5}+\frac{1}{7}\)
a)Tính bằng cách thuận tiện nhất :
\(\frac{1}{2}x\frac{1}{3}+\frac{1}{3}x\frac{1}{4}+\frac{1}{4}x\frac{1}{5}+\frac{1}{5}x\frac{1}{6}\)
b) Tính :
\(\left(1-\frac{1}{2}\right)x\left(1-\frac{1}{3}\right)x\left(1-\frac{1}{4}\right)\)
