a) Ta có:
\(1-\frac{67}{77}=\frac{10}{77}\)
\(1-\frac{73}{83}=\frac{10}{83}\)
Vì \(\frac{10}{77}>\frac{10}{83}\)mà 1 = 1 => \(\frac{67}{77}< \frac{73}{83}\)
b) Đợi suy nghĩ nha!!!!!! ^-^
\(\frac{11}{82}\)và \(\frac{16}{49}\)
\(\frac{11}{82}< \frac{11}{49}< \frac{16}{49}\)
Suy ra \(\frac{11}{82}< \frac{16}{49}\)