Bạn viết kiểu ngang như vậy khó hiểu lắm
a: \(=\dfrac{33}{14}\cdot\dfrac{52}{7}=\dfrac{858}{49}\)
b: \(=\dfrac{48}{72}\cdot\dfrac{108}{63}=\dfrac{2}{3}\cdot\dfrac{12}{7}=\dfrac{8}{7}\)
d: \(=\dfrac{55\cdot30}{33\cdot15}=\dfrac{5}{3}\cdot2=\dfrac{10}{3}\)