\(\frac{3}{\frac{9}{11}}>\frac{\frac{3}{9}}{11}>\frac{3}{9+11}>\frac{3}{9\times11}\).

\(\frac{22}{7}\)> \(\frac{11}{5}\)vì 22 : 7 = 3,14 ; 11: 5 = 2,2

\(\frac{15}{59}\)< \(\frac{24}{97}\)vì 15 : 59 = 0,21 ; 24 : 97 = 0,24

\(\frac{11}{19}\)< \(\frac{13}{18}\)vì 11 : 19 = 0,57 ; 13 : 18 = 0,72

\(\frac{7}{10}\)> \(\frac{4}{9}\)vì 7 : 10 = 0,7 ; 4 : 9 = 0,44
 

Ủa 15:59 ko ra0,21

Ta có : \(\frac{11}{12}=\frac{11.10}{12.10}=\frac{110}{120}\)

\(\frac{9}{10}=\frac{9.12}{10.12}=\frac{108}{120}\)

Ta thấy \(\frac{110}{120}>\frac{108}{120}\Rightarrow\frac{11}{20}>\frac{9}{10}\)

Vậy \(\frac{11}{20}>\frac{9}{10}\)

\(\frac{11}{12}>\frac{9}{10}\)

Ai nhanh được k nha :))

Trả lời 

\(A=\frac{11}{12+13}+\frac{12}{13+14}+\frac{1}{14+15}\)

Hay 

\(A=\frac{11}{12+13}+\frac{12}{13+14}+\frac{13}{14+15}\)

mong xem lại hộ cái 

8/9 = 8x3/9x3=24/27

12/13 = 12x2/13x2=24/26

Vậy 24/26 > 24/27

12/36 = 12x5/35x5 = 60/175

15/60=15x4/60x4 = 60/240

60/175 > 60/240 nên 12/36 > 15/60

\(a.\frac{8}{9}và\frac{12}{13}\)

\(\frac{8}{9}=\frac{8\times3}{9\times3}=\frac{24}{27}vả\frac{12}{13}=\frac{12\times2}{13\times2}=\frac{24}{26}\)

\(Vì\frac{24}{27}< \frac{24}{26}nên\frac{8}{9}< \frac{12}{13}\)

\(b.\frac{12}{36}và\frac{15}{60}\)

\(\frac{12}{36}=\frac{12\div4}{36\div4}=\frac{3}{9}và\frac{15}{60}=\frac{15\div5}{60\div5}=\frac{3}{12}\)

\(Vì\frac{3}{9}>\frac{3}{12}nên\frac{12}{36}>\frac{15}{60}\)

A<13 tick minh nha ban

Đáp án là A<13

ủng hộ mk nha mọi người

8<9<1 mà 9/8>1=> 9/8>8/9

Vì \(\frac{8}{9}< 1;1< \frac{9}{8}\)nên\(\frac{8}{9}< \frac{9}{8}\)

Nhớ k nha !

\(\frac{1}{13}+\frac{3}{13}+\frac{5}{13}+\frac{7}{13}+\frac{9}{13}+\frac{11}{13}\)

\(=\frac{1+3+5+7+9+11}{13}\)

\(=\frac{36}{13}\)

\(\frac{1}{13}+\frac{3}{13}+\frac{5}{13}+\frac{7}{13}+\frac{9}{13}+\frac{11}{13}\)

\(=\frac{1+3+5+7+9+11}{13}\)

\(=\frac{36}{13}\)