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a. 18/72 = 1/4
15/20 = 3/4
vì 1/4<3/4 nên 18/72<15/20
b. 24/36 = 2/3
20/50 = 2/5
2/3>2/5 nên 24/36>20/50
a, \(\dfrac{18}{72}\) = \(\dfrac{18:18}{72:18}\) = \(\dfrac{1}{4}\); \(\dfrac{15}{20}\) = \(\dfrac{3}{4}\)
Vì \(\dfrac{1}{4}\) < \(\dfrac{3}{4}\) nên \(\dfrac{18}{72}\) < \(\dfrac{15}{20}\)
b, \(\dfrac{24}{36}\) = \(\dfrac{24:12}{36:12}\) = \(\dfrac{2}{3}\); \(\dfrac{20}{50}\) = \(\dfrac{20:10}{50:10}\) = \(\dfrac{2}{5}\)
Vì \(\dfrac{2}{3}\) > \(\dfrac{2}{5}\) nên \(\dfrac{24}{36}\) > \(\dfrac{20}{50}\)
\(\frac{15}{30}=\frac{15:15}{30:15}=\frac{1}{2}\)
\(\frac{20}{25}=\frac{20:5}{25:5}=\frac{4}{5}\)
\(\frac{18}{18}=1\)
\(\frac{25}{45}=\frac{25:5}{45:5}=\frac{5}{9}\)
\(\frac{15}{30}=\frac{1}{2}\)
\(\frac{20}{25}=\frac{4}{5}\)
\(\frac{18}{18}=1\)
\(\frac{25}{45}=\frac{5}{9}\)
a) \(\dfrac{8}{16}=\dfrac{8:8}{16:8}=\dfrac{1}{2}\)
b) \(\dfrac{10}{30}=\dfrac{10:10}{30:10}=\dfrac{1}{3}\)
c) \(\dfrac{24}{18}=\dfrac{24:6}{18:6}=\dfrac{4}{3}\)
d) \(\dfrac{20}{28}=\dfrac{20:4}{28:4}=\dfrac{5}{7}\)
12/18=2/3 [rút gọn cho 6]
4/40=1/10 [rút gọn cho 4]
18/24=3/4 [rút gọn cho 6]
20/35=4/7 [rút gọn cho 5]
60/12=5
a) \(\dfrac{1}{4},\dfrac{6}{5},\dfrac{16}{9}\)
b)
\(\dfrac{4}{10}=\dfrac{2}{5}\)
\(\dfrac{10}{20}=\dfrac{1}{2}\)
\(\dfrac{8}{18}=\dfrac{4}{9}\)
\(\frac{18}{20}=\frac{18:2}{20:2}=\frac{9}{10}\)
#H
bằng \(\frac{9}{10}\)nhé