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a) \(\dfrac{2}{5}=\dfrac{4}{10}\)
\(\dfrac{4}{10}>\dfrac{3}{10}\)
b) \(\dfrac{5}{6}=\dfrac{10}{12}\)
\(\dfrac{7}{12}< \dfrac{10}{12}\)
c) \(\dfrac{1}{2}=\dfrac{2}{4}\)
\(\dfrac{3}{4}< \dfrac{2}{4}\)
d) \(\dfrac{8}{3}=\dfrac{56}{21}\)
\(\dfrac{56}{21}>\dfrac{11}{21}\)
a) \(\dfrac{3}{4}=\dfrac{3\times4}{4\times4}=\dfrac{12}{16}\)
b) \(\dfrac{1}{3}=\dfrac{1\times3}{3\times3}=\dfrac{3}{9}\)
c) \(\dfrac{5}{6}=\dfrac{5\times3}{6\times3}=\dfrac{15}{18}\)
a)
\(\dfrac{5}{9}< \dfrac{9}{9}\)
\(\dfrac{8}{7}>\dfrac{7}{7}\)
\(\dfrac{9}{9}=1\)
\(\dfrac{18}{4}>\dfrac{3}{4}\)
b)
\(\dfrac{2}{5},\dfrac{3}{5},\dfrac{8}{5}\)
\(\dfrac{5}{2}=\dfrac{15}{6},\dfrac{1}{6},1=\dfrac{6}{6}\rightarrow\dfrac{1}{6},\dfrac{6}{6},\dfrac{15}{6}\)
\(\frac{3}{4}\)và \(\frac{4}{5}\)
\(\frac{15}{20}\)và \(\frac{16}{20}\)
=> \(\frac{15}{20}< \frac{16}{20}\)
\(\frac{2}{5}\)và\(\frac{3}{10}\)
\(\frac{4}{10}\)và\(\frac{3}{10}\)
=> \(\frac{4}{10}>\frac{3}{10}\)
\(\frac{5}{6}\)và\(\frac{7}{8}\)
\(\frac{20}{24}\)và\(\frac{21}{24}\)
=> \(\frac{20}{24}< \frac{21}{24}\)
ta có 2/6=8/24
5/8=15/24
vậy ta có 15/24>8/24 nên 5/8>2/6
\(\frac{2}{6}=\frac{2.8}{6.8}=\frac{16}{48}\)
\(\frac{5}{8}=\frac{5.6}{8.6}=\frac{30}{48}\)
Vì \(\frac{16}{48}< \frac{30}{48}\) nên \(\frac{2}{6}< \frac{5}{8}\)
Tk cho mk nha
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 \(\dfrac{8}{16}< \dfrac{5}{2}\).
3/4 va 4/5
Quy dong len mau 20
15/20 va 16/20
15<16
Suy ra 15/20<16/20
3/4<4/5
b)5/8 va 4/9
Quy ddong len 72
40/72 va 32/72
40>32
40/72>32/72
Suy ra :5/8>4/9
Rút gọn 2 phân số:
\(\dfrac{2}{6}=\dfrac{2:2}{6:2}=\dfrac{1}{3}\)
\(\dfrac{4}{8}=\dfrac{4:4}{8:4}=\dfrac{1}{2}\)
Quy đồng hai phân số vừa rút gọn được:
Mẫu số chung của hai phân số trên là \(6\).
Ta có:
\(\dfrac{1}{3}=\dfrac{1\times2}{3\times2}=\dfrac{2}{6}\)
\(\dfrac{1}{2}=\dfrac{1\times3}{2\times3}=\dfrac{3}{6}\)
Mà \(\dfrac{2}{6}< \dfrac{3}{6}\) nên \(\dfrac{1}{3}< \dfrac{1}{2}\) hay \(\dfrac{2}{6}< \dfrac{4}{8}\).