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quy đồng lên là được

So sánh các phân số sau bằng cách hợp lý nhất

a. 8/9 < 7/5

b.   4/5 > 3/4

a ) Ta có 

\(\frac{29}{33}>\frac{29}{37}\)( đồng tử khác mẫu )

\(\frac{22}{37}< \frac{29}{37}\)( đồng mẫu khác tử )

=> \(\frac{29}{33}>\frac{29}{37}>\frac{22}{37}\)

b )  \(\frac{163}{257}< \frac{163}{221}\)

  \(\frac{162}{257}>\frac{149}{257}\)

  \(\Rightarrow\frac{163}{221}>\frac{163}{257}>\frac{149}{257}\)

a) ta có: \(\frac{22}{37}< \frac{29}{37}\)

\(\frac{29}{33}>\frac{29}{37}\)

\(\Rightarrow\frac{22}{37}< \frac{29}{37}< \frac{29}{33}\)

b) ta có: \(\frac{163}{257}>\frac{149}{257}\)

\(\frac{163}{221}>\frac{163}{257}\)

\(\Rightarrow\frac{163}{221}>\frac{163}{257}>\frac{149}{257}\)

a. \(\dfrac{10}{21}>1\)

\(\dfrac{9}{23}< 1\)

\(\Rightarrow\dfrac{10}{21}>\dfrac{9}{23}\)

b. \(\dfrac{32}{33}>\dfrac{31}{33}>\dfrac{31}{34}\Rightarrow\dfrac{32}{33}>\dfrac{31}{34}\)

c. \(\dfrac{44}{47}< \dfrac{45}{47}< \dfrac{45}{46}\Rightarrow\dfrac{44}{47}< \dfrac{45}{46}\)

\(d.\dfrac{70}{117}< \dfrac{70}{115}=\dfrac{14}{23}\Rightarrow\dfrac{70}{117}< \dfrac{14}{23}< \dfrac{15}{23}\)

\(\Rightarrow\dfrac{70}{117}< \dfrac{15}{23}\)

21/29 và 171717/979797

Ta có: 171717/979797=17/97 sấp sỉ 0,2

21/29=sấp sỉ 0,7

=>21/29>171717/979797

Ta có:

mà \(\frac{17}{19}>\frac{17}{97}\)=>\(\frac{21}{29}>\frac{17}{19}>\frac{171717}{979797}\)=>\(\frac{21}{29}>\frac{171717}{979797}\)

B1:

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B2:

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b1

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b, <

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ửk89q785tuesw89ynjkinyi

a: \(-\dfrac{11}{33}< 0< \dfrac{25}{16}\)

b: \(-\dfrac{17}{23}=\dfrac{-171717}{232323}\)

a: =50-52=-2

b: =-35+149-114

=-149+149

=0

c: =-29x100=-2900