Question

[Đỗ Thị Mai Anh]

\(\frac{10}{18}\)+\(\frac{4}{9}\)+\(\frac{26}{10}\)+\(\frac{12}{5}\)+\(\frac{9}{15}\)

\(\frac{10}{18}\)+\(\frac{4}{9}\)+\(\frac{1}{8}\)+\(\frac{1}{16}\)+\(\frac{1}{32}\)+....+\(\frac{1}{64}\)+\(\frac{1}{128}\)

\(\frac{2}{6}\)+\(\frac{2}{12}\)+\(\frac{2}{20}\)+.....+\(\frac{2}{90}\)+\(\frac{2}{100}\)

bài này tính nhanh nha

Answer 1

[I have a crazy idea]

\(\frac{10}{18}+\frac{4}{9}+\frac{26}{10}+\frac{12}{5}+\frac{9}{15}\)

\(=\frac{5}{9}+\frac{4}{9}+\frac{13}{5}+\frac{12}{5}+\frac{3}{5}\)

\(=\left(\frac{5}{9}+\frac{4}{9}\right)+\left(\frac{13}{5}+\frac{12}{5}+\frac{3}{5}\right)\)

\(=1+\frac{28}{5}\)

\(=\frac{33}{5}\)

Answer 2

[Trần Phúc]

Ta có:

a) \(\frac{10}{18}+\frac{4}{9}+\frac{26}{10}+\frac{12}{5}+\frac{9}{15}=\frac{5}{9}+\frac{4}{9}+\frac{13}{5}+\frac{12}{5}+\frac{9}{15}=1+1+\frac{9}{15}=1\frac{9}{15}\)

b)\(\frac{10}{18}+\frac{4}{9}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}=\left(\frac{5}{9}+\frac{4}{9}\right)+\left(\frac{16}{128}+\frac{8}{128}+\frac{4}{128}+\frac{2}{128}+\frac{1}{128}\right)\)

\(=1+\frac{31}{128}=1\frac{31}{128}\)