Giải cho mình cho mình với sáng mai mình phải nộp bài này rồi

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 : \(\frac{33}{55}=\frac{33:11}{55:11}=\frac{3}{5}\)

\(\Rightarrow\frac{3}{5}=\frac{33}{55}\)

\(b,\)Ta có : \(\frac{1212}{1313}=\frac{1212:101}{1313:101}=\frac{12}{13}\)

\(\Rightarrow\frac{12}{13}=\frac{1212}{1313}\)

\(c,\)Ta có : \(\frac{20}{28}=\frac{20:4}{28:4}=\frac{5}{7}\)

\(\Rightarrow\frac{5}{7}=\frac{20}{28}\)

\(d,\)Ta có : \(\frac{6}{21}=\frac{6:3}{21:3}=\frac{2}{7}\)

Vì \(\frac{5}{7}>\frac{2}{7}\Rightarrow\frac{5}{7}>\frac{6}{21}\)

a) \(\dfrac{12}{14}=\dfrac{1200}{1400}=\dfrac{1400-200}{1400}=1-\dfrac{200}{1400}\)

\(\dfrac{1212}{1414}=\dfrac{1414-200}{1414}=1-\dfrac{200}{1414}\)

vì \(\dfrac{200}{1414}< \dfrac{200}{1400}\)

Nên \(1-\dfrac{200}{1400}< 1-\dfrac{200}{1414}\)

Vậy \(\dfrac{12}{14}< \dfrac{1212}{1414}\)

Các bài sau tương tự

giúp mình với được ko ạh

giúp mình đi được ko, mình đang cần gấp

Bài 2: So sánh các phân số sau

7/15 > 5/13              11/12 > 7/48        24/35 > 21/7           15/26 > 7/8

a) \(\dfrac{23}{24}< 1\)

\(\dfrac{24}{23}>1\)

\(\Rightarrow\dfrac{23}{24}< \dfrac{24}{23}\)

b) \(\dfrac{4}{21}< \dfrac{4}{20}=\dfrac{1}{5}=\dfrac{6}{30}< \dfrac{6}{29}\)

c) \(\dfrac{6}{7}=1-\dfrac{1}{7}< \dfrac{8}{9}=1-\dfrac{1}{9}\)

d) \(\dfrac{1212}{1313}=\dfrac{12\times101}{13\times101}=\dfrac{12}{13}\)

a, \(\dfrac{18}{24}\) = \(\dfrac{3}{4}\)                            \(\dfrac{15}{25}\) = \(\dfrac{3}{5}\) 

     \(\dfrac{3}{4}\)  >  \(\dfrac{3}{5}\) vậy \(\dfrac{18}{24}\) > \(\dfrac{15}{25}\)

b, \(\dfrac{21}{15}\) = \(\dfrac{7}{5}\)                            \(\dfrac{28}{24}\) = \(\dfrac{7}{6}\)

      \(\dfrac{7}{5}\)  >  \(\dfrac{7}{6}\) vậy \(\dfrac{21}{15}\)  >  \(\dfrac{28}{24}\) 

ᵃ, ᵗᵃ ʳᵘ́ᵗ ᵍᵒ̣ⁿ :\(\dfrac{18}{24}=\dfrac{3}{4}\) ;

 ᵗᵃ ʳᵘ́ᵗ ᵍᵒ̣ⁿ :\(\dfrac{15}{25}=\dfrac{3}{5}\)

Vì \(\dfrac{3}{4}>\dfrac{3}{5}\\ \Rightarrow\dfrac{18}{24}>\dfrac{15}{25}\)

ᵇ, ᵗᵃ ʳᵘ́ᵗ ᵍᵒ̣ⁿ :\(\dfrac{21}{15}=\dfrac{7}{5}\\ \dfrac{28}{24}=\dfrac{7}{6}\)

Vì \(\dfrac{7}{5}>\dfrac{7}{6}\\ \Rightarrow\dfrac{21}{15}>\dfrac{28}{24}\)

18/24=3/4

15/25=3/5

21/15=7/5

28/24=9/8

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