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a: \(\dfrac{119}{117}=1+\dfrac{2}{117}\)

\(\dfrac{117}{115}=1+\dfrac{2}{115}\)

mà 2/117<2/115

nên \(\dfrac{119}{117}< \dfrac{117}{115}\)

hay \(-\dfrac{119}{117}>-\dfrac{117}{115}\)

b: \(\dfrac{-22}{35}=\dfrac{-22\cdot177}{35\cdot177}=-\dfrac{3894}{6195}\)

\(\dfrac{-103}{177}=\dfrac{-103\cdot35}{177\cdot35}=\dfrac{-3605}{6195}\)

mà -3894<-3605

nên -22/35<-103/177

19 tháng 10 2017

Ta có:

\(\dfrac{-119}{117}=-1-\dfrac{2}{117}\)

\(\dfrac{-117}{115}=-1-\dfrac{2}{115}\)

\(\dfrac{2}{117}\) < \(\dfrac{2}{115}\) nên \(\dfrac{-119}{117}\) > \(\dfrac{-117}{115}\)

Vậy, \(\dfrac{-119}{117}\) > \(\dfrac{-117}{115}\)

Đặt 117=a; 119=b

Theo đề, ta có:

\(B=\left(3+\dfrac{1}{a}\right)\cdot\dfrac{1}{b}-\dfrac{4}{a}\cdot\left(5+\dfrac{b-1}{b}\right)-\dfrac{5}{a\cdot b}+8:\dfrac{a}{3}\)

\(=\dfrac{3a+1}{a}\cdot\dfrac{1}{b}-\dfrac{4}{a}\cdot\dfrac{5b+b-1}{b}-\dfrac{5}{ab}+\dfrac{24}{a}\)

\(=\dfrac{3a+1-24b+4-5}{ab}+\dfrac{24}{a}=\dfrac{3a-24b+24b}{ab}=\dfrac{3a}{ab}=\dfrac{3}{b}=\dfrac{3}{119}\)

7 tháng 9 2023

-22 /35 và -103/117

ta có 

-22/35=-2574/4094

-103/117=-3605/4094

=>-2574/4094>-3605/4094

=>-22 /35 > -103/117

7 tháng 9 2023

Số hơi to nhỉ :)

21 tháng 8 2017

a. \(\dfrac{-18}{91}\)\(\dfrac{-23}{114}\)

\(\dfrac{18}{91}< \dfrac{18}{90}=\dfrac{1}{5}=\dfrac{23}{115}< \dfrac{23}{114}\)

\(\Rightarrow\dfrac{-18}{91}>\dfrac{-23}{114}\)

b. \(\dfrac{-22}{35}\)\(\dfrac{-103}{177}\)

\(\dfrac{22}{35}=\dfrac{110}{175}>\dfrac{103}{175}>\dfrac{103}{177}\)

\(\Rightarrow\dfrac{-22}{35}< \dfrac{-103}{177}\)

a: \(\dfrac{-18}{91}>\dfrac{-18}{90}=\dfrac{-1}{5}\)

\(\dfrac{-23}{114}< \dfrac{-23}{115}=\dfrac{-1}{5}\)

Do đó: \(\dfrac{-18}{91}>\dfrac{-23}{114}\)

b: \(\dfrac{-22}{35}=\dfrac{-3894}{6195}\)

\(\dfrac{-103}{177}=\dfrac{-103\cdot35}{177\cdot35}=\dfrac{-3605}{6195}\)

mà -3894<-3605

nên -22/35<-103/177

18 tháng 9 2017

a. \(\dfrac{-18}{91}\)\(\dfrac{-23}{114}\) ( mẫu chung : 10374 )

Quy đồng : \(\dfrac{-18}{91}=\dfrac{-2052}{10374}\) ; \(\dfrac{-23}{114}=\dfrac{-2093}{10374}\)

\(\dfrac{-2052}{10374}>\dfrac{-2093}{10374}\Rightarrow\dfrac{-18}{91}>\dfrac{-23}{114}\)

Vậy...

b. \(\dfrac{-22}{35}\)\(\dfrac{-103}{177}\) ( MC = 6195 )

Quy đồng : \(\dfrac{-22}{35}=\dfrac{-3894}{6195};\dfrac{-103}{177}=\dfrac{-3605}{6195}\)

\(\dfrac{-3894}{6195}< \dfrac{-3605}{6195}\Rightarrow\dfrac{-22}{35}< \dfrac{-103}{177}\)

Vậy...

c. \(\dfrac{-22}{45}\)\(\dfrac{-17}{33}\)(MC=495)

Quy đồng : \(\dfrac{-22}{45}=\dfrac{-242}{495};\dfrac{-17}{33}=\dfrac{-255}{495}\)

\(\dfrac{-242}{495}>\dfrac{-255}{495}\Rightarrow\dfrac{-22}{45}>\dfrac{-17}{33}\)

Vậy

27 tháng 1 2021

\(\dfrac{-22}{45}=-\dfrac{2266}{45.103}>-\dfrac{2295}{45.103}=-\dfrac{51}{103}\)

Ta có: \(\dfrac{-22}{45}=\dfrac{-22\cdot103}{45\cdot103}=\dfrac{-2266}{4635}\)

\(\dfrac{-51}{103}=\dfrac{-51\cdot45}{103\cdot45}=\dfrac{-2295}{4635}\)

mà -2266>-2295

nên \(\dfrac{-22}{45}>\dfrac{-51}{103}\)

a: \(\dfrac{-13}{40}< \dfrac{-12}{40}\)

\(\dfrac{-5}{6}>\dfrac{-91}{104}\)

17 tháng 7 2023

Sao bn giống BT mình thế ?:)