Viết các phân số sau dưới dạng phân số có mẫu bằng 24.
− 5 6 ; 3 − 8 ; 7 12 ; − 25 100 ; 72 108 ; 10 60
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− 5 6 = − 10 24 ; 3 − 8 = − 9 24 ; 7 12 = 14 24 ; − 25 100 = − 1 4 = − 6 24 72 108 = 2 3 = 16 24 ; 10 60 = 1 6 = 4 24
a: 5/3=10/6=25/15=35/21
b: 5/7=35/49
6/15=12/30
4/5=16/20
c: 6=216/36=324/54=108/18
a)\(\dfrac{5}{3}=\dfrac{10}{6}=\dfrac{25}{15}=\dfrac{35}{21}\)
b)\(\dfrac{5}{7}=\dfrac{35}{49};\dfrac{6}{15}=\dfrac{12}{30};\dfrac{4}{5}=\dfrac{16}{20}\)
c) \(6=\dfrac{216}{36}=\dfrac{324}{54}=\dfrac{108}{18}\)
\(a,5=\dfrac{20}{4};11=\dfrac{44}{4};21=\dfrac{84}{4};200=\dfrac{800}{4};125=\dfrac{500}{4};2000=\dfrac{8000}{4}\\ b,2=\dfrac{108}{54};3=\dfrac{108}{36};108=\dfrac{108}{1};1=\dfrac{108}{108};9=\dfrac{108}{12};4=\dfrac{108}{27};6=\dfrac{108}{18}\)
\(10=\dfrac{10\cdot6}{6\cdot1}=\dfrac{60}{6}\)
\(6=\dfrac{6\cdot6}{1\cdot6}=\dfrac{36}{6}\)
\(101=\dfrac{101\cdot6}{6}=\dfrac{606}{6}\)
\(9=\dfrac{9\cdot6}{6}=\dfrac{54}{6}\)
\(22=\dfrac{22\cdot6}{6}=\dfrac{132}{6}\)
$5 = \frac{5}{1}$ ; $14 = \frac{{14}}{1}$ ; $327 = \frac{{327}}{1}$
$1 = \frac{1}{1}$ ; $0 = \frac{0}{1}$
\(5=\dfrac{5}{1}\)
\(14=\dfrac{14}{1}\)
\(327=\dfrac{327}{1}\)
\(1=\dfrac{1}{1}\)
\(0=\dfrac{0}{1}\)
a) \(\dfrac{2}{5}=\dfrac{1}{5}\cdot\dfrac{2}{1}\)
\(\dfrac{15}{12}=\dfrac{5}{4}=\dfrac{5}{2}\cdot\dfrac{1}{2}\)
\(\dfrac{5}{-12}=\dfrac{-5}{12}=\dfrac{-5}{3}\cdot\dfrac{1}{4}\)
\(\dfrac{-3}{-4}=\dfrac{3}{4}=\dfrac{3}{2}\cdot\dfrac{1}{2}\)
\(\dfrac{-5}{6}=\dfrac{-5\times4}{6\times4}=\dfrac{-20}{24}\)
\(\dfrac{3}{-8}=\dfrac{3\times\left(-3\right)}{-8\times\left(-3\right)}=\dfrac{-9}{24}\)
\(2=\dfrac{48}{24}\)
\(\dfrac{-25}{100}=\dfrac{-1}{4}=\dfrac{-1\times6}{4\times6}=\dfrac{-6}{24}\)
\(\dfrac{72}{108}=\dfrac{2}{3}=\dfrac{2\times8}{3\times8}=\dfrac{16}{24}\)
− 5 6 = − 10 24 ; 3 − 8 = − 9 24 ; 7 12 = 14 24 ; − 25 100 = − 1 4 = − 6 24 72 108 = 2 3 = 16 24 ; 10 60 = 1 6 = 4 24