Ta có: A = \(\frac{-2}{11}+\frac{6}{7}+\frac{1}{2}+\frac{-9}{11}+\frac{1}{7}\)
A = \(\left(\frac{-2}{11}+\frac{-9}{11}\right)+\left(\frac{6}{7}+\frac{1}{7}\right)+\frac{1}{2}\)

A = \(-1+1+\frac{1}{2}\)

A = \(\frac{1}{2}\)

B = \(\left(\frac{9}{16}+\frac{8}{27}\right)+\left(1+\frac{7}{16}+\frac{-19}{27}\right)\)

B = \(\frac{9}{16}+\frac{8}{27}+1+\frac{7}{16}-\frac{19}{27}\)

B = \(\left(\frac{9}{16}+\frac{7}{16}\right)+1+\left(\frac{8}{27}-\frac{19}{27}\right)\)

B = \(1+1-\frac{11}{27}\)

B = \(\frac{43}{27}\)

Mà 1/2 < 43/27 (Vì 1/2 < 1; 43/27 > 1)

=> A < B

                       Giải

\(A=\frac{-2}{11}+\frac{6}{7}+\frac{1}{2}+\frac{-9}{11}+\frac{1}{7}\)

\(\Leftrightarrow A=\left(\frac{-2}{11}+\frac{-9}{11}\right)+\left(\frac{6}{7}+\frac{1}{7}\right)+\frac{1}{2}\)

\(\Leftrightarrow A=\frac{-11}{11}+\frac{7}{7}+\frac{1}{2}\)

\(\Leftrightarrow A=-1+1+\frac{1}{2}\)

\(\Leftrightarrow A=\frac{1}{2}< 1\left(1\right)\)

\(B=\left(\frac{9}{16}+\frac{8}{27}\right)+\left(1+\frac{7}{16}+\frac{-19}{27}\right)\)

\(\Leftrightarrow B=\left(\frac{9}{16}+\frac{7}{16}\right)+\left(\frac{8}{27}+\frac{-19}{27}\right)+1\)

\(\Leftrightarrow B=\frac{16}{16}+\frac{-11}{27}+1\)

\(\Leftrightarrow B=1+\frac{-11}{27}+1\)

\(\Leftrightarrow B=2+\frac{-11}{27}\)

\(\Leftrightarrow B=\frac{43}{27}\)\(>1\left(2\right)\)

Từ (1) và (2) suy ra A < B

a, >

b, <

c, <

Quy đồng hoặc tìm phần bù       

a) \(3^{29}\)< \(10^{20}\)

b) \(3^{11}\)< \(17^{14}\)

c) \(27^4\): \(9^3\). \(81^4\) >  \(16^3\).\(32^4\)

320320 và 

Ta có: 274=(33)4=312<320274=(33)4=312<320

⇒320>274⇒320>274

225225 và 

Ta có:

166=(24)6=224<225166=(24)6=224<225

⇒225>224⇒225>224

534534 và 25.53025.530

Ta có:

25.530=532<53425.530=532<534

⇒534>25.530⇒534>25.530

10301030 và 450450

Ta có:

450=(22)50=2100=(210)10=102410450=(22)50=2100=(210)10=102410

1030=(103)10=100010<1024101030=(103)10=100010<102410

⇒1030<450

lưu ý 27 mà số 4 nhỏ ấy đấy là mũ nhé nhầm

ta có: \(\frac{10}{27}< \frac{10}{30}=\frac{1}{3}\)

\(\frac{9}{16}< \frac{9}{9}=1\)

\(\frac{11}{34}< \frac{11}{22}=\frac{1}{2}\)

=>A<\(\frac{1}{3}+1+\frac{1}{2}\)<2

vậy A<2

11^2<11^5

4^10>8^6

27^3<9^5