quy đồng mẫu số vs quy đồng tử số nhé.ra liền

Cách 1 :

Ta có : \(\frac{11}{12}=\frac{198}{216}\)

           \(\frac{17}{18}=\frac{201}{216}\)

Vì : 198 < 201 => \(\frac{198}{216}=\frac{11}{12}< \frac{201}{216}=\frac{17}{18}\)

Cách 2 :

Có : \(\frac{11}{12}=1-\frac{1}{12}\)

       \(\frac{17}{18}=1-\frac{1}{18}\)

Vì : \(\frac{1}{12}>\frac{1}{18}\)=>\(\frac{11}{12}< \frac{17}{18}\)

Ủng hộ nhá !!!

a,<

b,>

Tích nha

\(\frac{17}{2}=8\frac{1}{2}>5\)

5<17/2

\(\frac{17}{23}\)=\(\frac{85}{115}\)

Mà \(\frac{85}{115}\)> \(\frac{85}{117}\)

=> \(\frac{17}{23}\)>\(\frac{85}{117}\)

đổi : \(\frac{17}{23}=\frac{85}{115}\)

Do \(\frac{85}{115}>\frac{85}{117}\)

\(\Rightarrow\frac{17}{23}>\frac{85}{117}\)

-15 vs lại -9 à

Nếu là âm thì:

\(\frac{13}{17}>\frac{-15}{19}\);\(\frac{12}{48}>\frac{-9}{36}\)

\(\frac{17171718}{19191919}>\frac{17171717}{19191919}=\frac{17.1010101}{19.1010101}=\frac{17}{19}\)

=>\(\frac{17}{19}< \frac{17171718}{19191919}\)\

kkkkkkkkkk

Ta có: \(\frac{17171718}{19191919}=\frac{17171717}{19191919}+\frac{1}{19191919}=\frac{17}{19}+\frac{1}{19191919}\)

Vì \(\frac{17}{19}< \frac{17}{19}+\frac{1}{19191919}\)nên \(\frac{17}{19}< \frac{17171718}{19191919}\)

a/Ta có: \(\frac{7}{13}+\frac{6}{13}=1\)     ;\(\frac{17}{23}+\frac{6}{23}=1\)

Vì \(\frac{6}{13}>\frac{6}{23}\)nên\(\frac{7}{13}< \frac{17}{23}\)

b/Ta có: \(\frac{12}{48}< \frac{12}{47}\) ;     \(\frac{12}{47}< \frac{13}{47}\)\(\Rightarrow\frac{12}{48}< \frac{13}{47}\)

nhanh hộ mik đc ko ạ? Mik đang cần gấp 

a)2/15<8/17

b)12/17<13/18

c)9/20>3/7

d)17/18>15/19