Bài 1: Rút gọn rồi tính:
a)\(\frac{36}{45}+\frac{4}{25}\) \(\frac{3}{24}+\frac{12}{60}\)
b)\(\frac{14}{35}+\frac{36}{63}\) \(\frac{3}{21}+\frac{27}{15}\)
Bài 2: Tính:
a)\(\frac{16}{32}+9\) \(6+\frac{100}{300}\)
b)\(\frac{1000}{10000}+8\) \(\frac{100}{500000}+10\)