\(A=\frac{10^{17}+5}{10^{17}-8}=\frac{10^{17}-8+13}{10^{17}-8}=\frac{10^{17}-8}{10^{17}-8}+\frac{13}{10^{17}-8}=1+\frac{13}{10^{17}-8}\)

\(B=\frac{10^{17}}{10^{17}-3}=\frac{10^{17}-3+13}{10^{17}-3}=\frac{10^{17}-3}{10^{17}-3}+\frac{13}{10^{17}-3}=1+\frac{13}{10^{17}-3}\)

Nhận xét: \(10^{17}-8\frac{13}{10^{17}-3}\Rightarrow1+\frac{13}{10^{17}-8}>1+\frac{13}{10^{17}-3}\Rightarrow A>B\)

\(A=\frac{10^{17}+5}{10^{17}-8}=\frac{10^{17}-8+13}{10^{17}-8}=\frac{10^{17}-8}{10^{17}-8}+\frac{13}{10^{17}-8}=2+\frac{3}{10^{17}-8}\)

\(B=\frac{10^{17}}{10^{17}-3}=\frac{10^{17}-3+3}{10^{17}-3}=\frac{10^{17}-3}{10^{17}-3}+\frac{3}{10^{17}-3}=1+\frac{3}{10^{17}-3}\)

Do \(2+\frac{3}{10^{17}-8}>1+\frac{3}{10^{17}-3}\)n\(A>B\)

\(A=\frac{10^8+2}{10^8-1}=\frac{10^8-1+3}{10^8-1}=1+\frac{3}{10^8-1}\)

\(B=\frac{10^8}{10^8-3}=\frac{10^8-3+3}{10^8-3}=1+\frac{3}{10^8-3}\)

Nhận thầy 10⁸ - 1 > 10⁸ - 3

=> \(\frac{3}{10^8-1}< \frac{3}{10^8-3}\)

=> \(1+\frac{3}{10^8-1}< \frac{3}{10^8-3}+1\)

=> A < B

b) 17C = \(\frac{17\left(17^{203}+1\right)}{17^{204}+1}=\frac{17^{204}+1+16}{17^{204}+1}=1+\frac{16}{17^{204}+1}\)

17D = \(\frac{17\left(17^{202}+1\right)}{17^{203}+1}=\frac{17^{203}+1+16}{17^{203}+1}=1+\frac{16}{17^{203}+1}\)

Nhận thầy 17²⁰³ + 1 < 17²⁰⁴ + 1

=> \(\frac{16}{17^{203}+1}>\frac{16}{17^{204}+1}\)

=> \(\frac{16}{17^{203}+1}+1>\frac{16}{17^{204}+1}+1\Rightarrow17C>17D\Rightarrow C>D\) 

\(10A=\frac{10^{16}+10}{10^{16}+1}=\frac{10^{16}+1+9}{10^{16}+1}=1+\frac{9}{10^{16}+1}\)

\(10B=\frac{10^{17}+10}{10^{17}+1}=\frac{10^{17}+1+9}{10^{17}+1}=1+\frac{9}{10^{17}+1}\)

Nhận thấy: \(\frac{9}{10^{17}+1}< \frac{9}{10^{16}+1}\)=> 10B < 10A

=> A > B

A = ( 10^15+1 ) / ( 10^16+1 ) => 10A = ( 10^16+10 ) / ( 10^16+1 ) = 1 + ( 9/10^15+1 )

B = ( 10^16+1 ) / ( 10^17+1 ) => 10B = ( 10^17+10 ) / ( 10^17+1 ) = 1 + ( 9/10^16+1 )

Vì 10^15+1 < 10^16+1 nên 9/10^15+1 > 9/10^16+1 => 1 + ( 9/10^15+1 ) > 1 + ( 9/10^16+1 )

Vậy A > B

theo đè bài 

A>B

hok tốt

Ta có :

\(10A=\frac{10^{16}+10}{10^{16}+1}=\frac{\left(10^{16}+1\right)+9}{10^{16}+1}=1+\frac{9}{10^{16}+1}\)

\(10B=\frac{10^{17}+10}{10^{17}+1}=\frac{\left(10^{17}+1\right)+9}{10^{17}+1}=1+\frac{9}{10^{17}+1}\)

Vì \(10^{16}+1< 10^{17}+1\) nên \(\frac{9}{10^{16}+1}>\frac{9}{10^{17}+1}\) \(\Rightarrow1+\frac{9}{10^{16}+1}>1+\frac{9}{10^{17}+1}\)

=> 10A > 10B Do đó A > B

Vậy A > B

\(A=\frac{10^{15}+1}{10^{16}+1}\)

\(B=\frac{10^{16}+1}{10^{17}+1}\)

Ta có:

\(A=\frac{10^{15}+1}{10^{16}+1}=\frac{\left(10^{15}+1\right).10}{\left(10^{16}+1\right).10}=\frac{10^{16}+10}{10^{17}+10}=\frac{10^{16}+1+9}{10^{17}+1+9}\)

Vì \(B=\frac{10^{16}+1}{10^{17}+1}< 1\)

\(\Rightarrow B=\frac{10^{16}+1}{10^{17}+1}< \frac{10^{16}+1+9}{10^{17}+1+9}=A\)

Vậy B < A

A=1/10

B=1/10

Vậy hai phân số A và B bằng nhau

\(\frac{3}{5}>\frac{1}{5}\) 

\(\frac{9}{10}< \frac{11}{10}\)

\(\frac{13}{17}< \frac{15}{17}\)

\(\frac{25}{19}\)>\(\frac{22}{19}\)

3/5 > 1/5

9/10 < 11/10

13/17 < 15/17

25/19 > 22/19

T i c k cho mình nhé bạn!

bn k đi

cu lay phep tinh nay tru phep tinh kia hk ra thi nt hoi mink

\(\frac{10^{15}+1}{10^{16}+1}=\frac{10^{16}+10}{10^{17}+10}\)

Vì B<1 suy ra B<\(\frac{10^{16}+1+9}{10^{17}+1+9}=\frac{10^{16}+10}{10^{17}+10}=A\)

Vậy B<A

Ta có: \(10A=\frac{10^{16}+10}{10^{16}+1}=1+\frac{9}{10^{16}+1}\) ; \(10B=\frac{10^{17}+10}{10^{17}+1}=1+\frac{9}{10^{17}+1}\)

Mà \(\frac{9}{10^{16}+1}>\frac{9}{10^{17}+1}\) nên \(10A>10B\) => \(A>B\)