Thực hiện các phép tính:1. \(2xy\left( {x + 2y} \r...

Câu hỏi: Thực hiện các phép tính:1. \(2xy\left( {x + 2y} \right)\)2. \(\left( {x + 1} \right)\left( {2x - 1} \right)\)3. \(10{x^4}{y^3}:6{x^2}{y^2}\)4. \(\left( {{x^3} - 8} \right):\left( {{x^2} + 2x + 4} \right)\)

A \(\begin{array}{l}1.\,\,2{x^2}y + 2x{y^2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3.\,\,\frac{5}{3}{x^2}y\\2.\,\,2{x^2} + x - 1\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,4.\,\,x - 2\end{array}\)  

B \(\begin{array}{l}1.\,\,2{x^2}y + 2x{y^2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3.\,\,\frac{5}{3}xy\\2.\,\,2{x^2} + x - 1\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,4.\,\,x + 2\end{array}\)

C \(\begin{array}{l}1.\,\,2{x^2}y + 2x{y^2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3.\,\,\frac{5}{3}{x^2}y\\2.\,\,2{x^2} - x - 1\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,4.\,\,x + 2\end{array}\)

D \(\begin{array}{l}1.\,\,2{x^2}y + 2x{y^2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3.\,\,\frac{5}{3}{x^2}y\\2.\,\,2{x^2} - x - 1\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,4.\,\,x - 2\end{array}\)