1. Tính: \(\frac{1}{5}{x^2}y\left( {15x{y^2} - 5y...

Câu hỏi: 1. Tính: \(\frac{1}{5}{x^2}y\left( {15x{y^2} - 5y + 3xy} \right).\)2. Phân tích các đa thức sau thành nhân tử:a. \(5{x^3} - 5x\)b. \(3{x^2} + 5y - 3xy - 5x\)

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

B \(\begin{array}{l}1.\,\,\,{x^3}{y^3} - {x^2}{y^2} + \frac{3}{5}{x^2}{y^3}\\2.\,a)\,\,5\left( {x - 1} \right)\left( {x + 1} \right)\\b)\,\left( {3x - 5} \right)\left( {x - y} \right)\end{array}\)

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

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