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\(^{\dfrac{27}{20}}\) =\(\dfrac{27:4}{20:4}\) = \(\dfrac{8}{5}\)
a, 20 x 5 - 20/20
= 100 - 1 =99
b, 1717 - 101/2525 + 707
= 2424 - 1/25
= 60599/25
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 \(\dfrac{24}{36}\) > \(\dfrac{20}{50}\)
\(\dfrac{3}{9}=\dfrac{3:3}{9:3}=\dfrac{1}{3}\)
\(\dfrac{15}{27}=\dfrac{15:3}{27:3}=\dfrac{5}{9}\)
\(\dfrac{28}{20}=\dfrac{28:4}{20:4}=\dfrac{7}{5}\)
\(\dfrac{5}{105}=\dfrac{5:5}{105:5}=\dfrac{1}{21}\)
\(\dfrac{24}{39}=\dfrac{24:3}{39:3}=\dfrac{8}{13}\)
\(\frac{20x30x6}{5x6x6x6}\)
\(=\frac{2x2x5x5x6x6}{5x6x6x3x2}\)
\(=\frac{2x5}{3}=\frac{10}{3}\)
\(\frac{20\text{x}30\text{x}6}{5\text{x}6\text{x}6\text{x}6}=\frac{5\text{x}4\text{x}5\text{x}6\text{x}6}{5\text{x}6\text{x}6\text{x}6}=\frac{1\text{x}4\text{x}5\text{x}1\text{x}1}{1\text{x}1\text{x}1\text{x}6}=\frac{20}{6}=\frac{10}{3}\)
20 x 5 - 20/20
= 20 x 5 - 1
= 100 - 1
= 99
\(20\times5-\frac{20}{20}\)
\(=100-1\)
\(=99\)
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