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a: \(\dfrac{5}{3}\cdot\dfrac{7}{10}=\dfrac{5}{10}\cdot\dfrac{7}{3}=\dfrac{14}{3}>2\)
\(\dfrac{5}{7}:\dfrac{7}{10}=\dfrac{5}{7}\cdot\dfrac{10}{7}=\dfrac{50}{49}< 2\)
=>\(\dfrac{5}{3}\cdot\dfrac{7}{10}>\dfrac{5}{7}:\dfrac{7}{10}\)
b: \(\dfrac{4}{5}\cdot\dfrac{5}{6}=\dfrac{4}{6}=\dfrac{2}{3}\)
\(\dfrac{8}{9}:\dfrac{4}{3}=\dfrac{8}{9}\cdot\dfrac{3}{4}=\dfrac{8}{4}\cdot\dfrac{3}{9}=\dfrac{2}{3}\)
Do đó: \(\dfrac{4}{5}\cdot\dfrac{5}{6}=\dfrac{8}{9}:\dfrac{4}{3}\)
c: \(\dfrac{5}{11}\cdot\dfrac{33}{15}=\dfrac{5}{15}\cdot\dfrac{33}{11}=\dfrac{3}{3}=1\)
\(\dfrac{6}{17}\cdot\dfrac{34}{25}=\dfrac{34}{17}\cdot\dfrac{6}{25}=2\cdot\dfrac{6}{25}=\dfrac{12}{25}< 1\)
=>\(\dfrac{5}{11}\cdot\dfrac{33}{15}>\dfrac{6}{17}\cdot\dfrac{34}{25}\)
d: \(\dfrac{15}{19}\cdot\dfrac{38}{5}=\dfrac{15}{5}\cdot\dfrac{38}{19}=3\cdot2=6\)
\(\dfrac{15}{16}:\dfrac{3}{8}=\dfrac{15}{16}\cdot\dfrac{8}{3}=\dfrac{15}{3}\cdot\dfrac{8}{16}=\dfrac{5}{2}\)<6
=>\(\dfrac{15}{19}\cdot\dfrac{38}{5}>\dfrac{15}{16}:\dfrac{3}{8}\)
\(34=\dfrac{9}{12}\) S
\(\dfrac{5}{8}< \dfrac{3}{8}\) S
\(\dfrac{4}{5}>\dfrac{4}{7}\) D
\(1< \dfrac{15}{16}\) S
`4/15 < 4/13`
`7/6 > 8/9`
`14/11 > 14/19`
`5/6 >3/4`
9/14 .<.. 11/14 4/25 .<.. 4/23 5/6 ..<. 7/8 1 ..>. 14/15
8/9 ..=. 24/27 20/19 ..>. 20/27 8/7 .>.. 9/8 1 .<..15/14
= ( 4/5 + 16/5 ) + (7/13 + 19/13) + (15/8 - 7/8)
= 20/5 + 26/13 + 1
= 20:5 + 26:13 + 1
= 4 + 2 + 1 = 7
4/5 +7/13+15/8+19/13 -7/8+16/5
=TA SẼ LOẠI CÁC CHỮ SỐ GIỐNG NHAU
\(\frac{5}{7}\)<\(\frac{7}{9}\)
\(\frac{7}{8}\)<\(\frac{5}{6}\)
\(\frac{10}{15}\)=\(\frac{16}{24}\)
\(\frac{19}{43}\)<\(\frac{19}{34}\)
\(\frac{5}{7}< \frac{7}{9};\)\(\frac{7}{8}>\frac{5}{6};\)\(\frac{10}{15}=\frac{16}{24};\)\(\frac{19}{43}< \frac{19}{34}\)
mk nhé
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