Question

[hello hello]

1. rút gọn rồi quy đồng mẫu các phân số

a. \(\dfrac{4.5+4.11}{8.7+4.3}\), \(\dfrac{-15.8+10.7}{5.6+20.3}\)và\(\dfrac{2^4.5^2.7}{2^3.5.7^2.11}\)

Answer 1

[Nguyễn Lê Phước Thịnh]

a: \(\dfrac{4\cdot5+4\cdot11}{8\cdot7+4\cdot3}=\dfrac{20+44}{56+12}=\dfrac{64}{68}=\dfrac{16}{17}=\dfrac{11088}{11781}\)

\(\dfrac{-15\cdot8+10\cdot7}{5\cdot6+20\cdot3}=\dfrac{-120+70}{30+60}=\dfrac{-50}{90}=\dfrac{-5}{9}=\dfrac{-6545}{11781}\)

\(\dfrac{2^4\cdot5^2\cdot7}{2^3\cdot5\cdot7^2\cdot11}=\dfrac{2\cdot5}{7\cdot11}=\dfrac{10}{77}=\dfrac{1530}{11781}\)