Toán Lớp 8: phan tich thanh nhan tu 5x^4+3x^3y-20x^2y^2-12xy^3
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Toán Lớp 8: phan tich thanh nhan tu 5x^4+3x^3y-20x^2y^2-12xy^3
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5{x^4} + 3{x^3}y – 20{x^2}{y^2} – 12x{y^3}\\
= x\left( {5{x^3} + 3{x^2}y – 20x{y^2} – 12{y^3}} \right)\\
= x.\left( {{x^2}\left( {5x + 3y} \right) – 4{y^2}\left( {5x + 3y} \right)} \right)\\
= x.\left( {5x + 3y} \right)\left( {{x^2} – 4{y^2}} \right)\\
= x.\left( {5x + 3y} \right)\left( {x + 2y} \right)\left( {x – 2y} \right)
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