Question

Rút gọn cheo trước khi nhân 1, -7/4 . 2/9 2, 12/-13 . 26/-5 3, 20/11 .55/21 4, -8/15 . 5/16 Giúp vs mn ơi đag cần gấp

Answer 1

1: \(\dfrac{-7}{4}\cdot\dfrac{2}{9}=\dfrac{-14}{36}=\dfrac{-7}{18}\)

2: \(=\dfrac{12}{13}\cdot\dfrac{26}{5}=\dfrac{24}{5}\)

3: \(=\dfrac{20}{11}\cdot\dfrac{55}{21}=\dfrac{100}{21}\)

4: \(=\dfrac{-40}{240}=\dfrac{-1}{6}\)