Question

xếp các phân số sau theo thứ tự giảm dần :

\(\frac{2}{5};\frac{1}{2};\frac{2}{3};\frac{3}{4}\)

Answer 1

\(\frac{2}{5}\); \(\frac{1}{2}\); \(\frac{2}{3}\); \(\frac{3}{4}\)MSC: 60

Ta có:

\(\frac{2}{5}\)= \(\frac{2x12}{5x12}\)= \(\frac{24}{60}\)    \(\frac{1}{2}\)= \(\frac{1x30}{2x30}\)= \(\frac{30}{60}\)

\(\frac{2}{3}\)= \(\frac{2x20}{3x20}\)= \(\frac{40}{60}\) \(\frac{3}{4}\)= \(\frac{3x15}{4x15}\)= \(\frac{45}{60}\)

Vì \(\frac{45}{60}\)> \(\frac{40}{60}\)>\(\frac{30}{60}\)> \(\frac{24}{60}\)nên ta sắp xếp như sau: \(\frac{3}{4}\); \(\frac{2}{3}\); \(\frac{1}{2}\); \(\frac{2}{5}\)

tk nhé

Answer 2

\(\frac{3}{4};\frac{2}{3};\frac{1}{2};\frac{2}{5}\)