Toán Lớp 8: Tính nhân : (x – 3y)(3x2 + y2 +5xy)

(x-3y)(3x^2+y^2+5xy) =3x^3+xy^2+5x^2y-9x^2y-3y^3-15xy^2 =3x^3+(xy^2-15xy^2)+(5x^2y-9x^2y)-3y^3 =3x^3-14xy^2-4x^2y-3y^3

(x - 3y)(3x² + y² + 5xy) =3x².x + x.y² + 5xy.x - 3y.3x² - 3y.y² - 3y.5xy =3x³ + xy² + 5x²y - 9x²y - 3y³ - 15xy² =3x³ - 3y³ - 4x²y -14xy²

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Toán Lớp 8: Tính nhân : (x – 3y)(3×2 + y2 +5xy)

Home/ Toán Lớp 8: Tính nhân : (x – 3y)(3×2 + y2 +5xy)