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a) \(\dfrac{6}{14}=\dfrac{6:2}{14:2}=\dfrac{3}{7}\)
\(\dfrac{3}{7}< \dfrac{4}{7}\)
b) \(\dfrac{6}{15}=\dfrac{6:3}{15:3}=\dfrac{2}{5}\)
\(\dfrac{3}{5}>\dfrac{2}{5}\)
c) \(\dfrac{10}{18}=\dfrac{10:2}{18:2}=\dfrac{5}{9}\)
\(\dfrac{5}{9}>\dfrac{2}{9}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
\(\dfrac{6}{12}=\dfrac{6:6}{12:6}=\dfrac{1}{2}\)
\(\Rightarrow\dfrac{1}{2}=\dfrac{1\times2}{2\times2}=\dfrac{2}{4}\)
Mà \(\dfrac{2}{4}< \dfrac{3}{4}\)
Vậy \(\dfrac{6}{12}< \dfrac{3}{4}\).
b)
\(\dfrac{8}{10}=\dfrac{8:2}{10:2}=\dfrac{4}{5}\)
Mà \(\dfrac{2}{5}< \dfrac{4}{5}\)
Vậy \(\dfrac{2}{5}< \dfrac{8}{10}\).
c)
\(\dfrac{40}{35}=\dfrac{40:5}{35:5}=\dfrac{8}{7}\)
Mà \(\dfrac{8}{7}>\dfrac{6}{7}\)
Vậy \(\dfrac{40}{35}>\dfrac{6}{7}\).
d)
\(\dfrac{8}{16}=\dfrac{8:8}{16:8}=\dfrac{1}{2}\)
Mà \(\dfrac{1}{2}< \dfrac{5}{2}\)
Vậy \(\dfrac{8}{16}< \dfrac{5}{2}\).
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\(\dfrac{5}{7}\)>\(\dfrac{6}{21}\)
\(\dfrac{18}{24}\)>\(\dfrac{15}{25}\)
\(\dfrac{12}{13}\)=\(\dfrac{1212}{1313}\)
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a: 90/126=5/7<6/7
b: 70/84=5/6
35/42=5/6
=>70/84=35/42
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Câu hỏi của hoang van binh - Toán lớp 4 - Học trực tuyến OLM
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Câu hỏi của hoang van binh - Toán lớp 4 - Học trực tuyến OLM
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a) \(\frac{33}{55}=\frac{33:11}{55:11}=\frac{3}{5}\)
Vì \(\frac{3}{5}=\frac{3}{5}\)nên \(\frac{3}{5}=\frac{33}{55}\)
\(\frac{20}{28}=\frac{20:4}{28:4}=\frac{5}{7}\)
Vì \(\frac{5}{7}=\frac{5}{7}\)nên \(\frac{5}{7}=\frac{20}{28}\)
b) \(\frac{6}{21}=\frac{6:3}{21:3}=\frac{2}{7}\)
Vì \(\frac{5}{7}>\frac{2}{7}\)nên \(\frac{5}{7}>\frac{6}{21}\)
\(\frac{1212}{1313}=\frac{1212:101}{1313:101}=\frac{12}{13}\)
VÌ \(\frac{12}{13}=\frac{12}{13}\)nên \(\frac{12}{13}=\frac{1212}{1313}\)
a) Rút gọn 33/55=3/5 => 3/5 = 3/5 hay 3/5=20/28
b) rút gọn 20/28= 5/7=> 5/7= 5/7 hay 5/7 = 20/28
c) rút gọn 6/21 = 2/7=> 5/7 >2/7 hay 5/7>6/21
d) rút gọn 1212/1313 = 12/13=> 12/13=12/13 hay 12/13=1212/1313
a)Ta có:
\(\dfrac{90}{160}=\dfrac{90:10}{160:10}=\dfrac{9}{16}=\dfrac{9\times7}{16\times7}=\dfrac{63}{112}\)
\(\dfrac{6}{7}=\dfrac{6\times16}{7\times16}=\dfrac{96}{112}\)
\(\Rightarrow\dfrac{90}{160}< \dfrac{6}{7}\)
b)Ta có:
\(\dfrac{18}{20}=\dfrac{18:2}{20:2}=\dfrac{9}{10}\)
\(\Rightarrow\dfrac{18}{20}>\dfrac{7}{10}\)
\(a,\dfrac{90}{160}=\dfrac{9}{16}\\ MSC:112\\ \dfrac{9}{16}=\dfrac{9.7}{16.7}=\dfrac{63}{112}\\ \dfrac{6}{7}=\dfrac{6.16}{7.16}=\dfrac{96}{112}\\ 63< 96\\ =>\dfrac{90}{160}< \dfrac{6}{7}\\ b,\dfrac{18}{20}=\dfrac{9}{10}\\ 9>7\\ =>\dfrac{18}{20}>\dfrac{7}{10}\)