Question

[Ngô Thị Thùy]

tính nhanh:

\(\frac{\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}}{\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{30}}\)

Answer 1

[Michiel Girl mít ướt]

tính tử:

\(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}=\frac{8}{16}+\frac{4}{16}+\frac{2}{16}+\frac{1}{16}=\frac{15}{16}\)

Tính mẫu: 

\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{30}=\frac{15}{30}+\frac{5}{30}+\frac{2,5}{30}+\frac{1}{30}=\frac{23,5}{30}=\frac{235}{300}=\frac{47}{60}\)

Có: \(\frac{15}{16}:\frac{47}{60}=\frac{15}{16}.\frac{60}{47}=1\frac{37}{188}\)