Phân tích các đa thức sau thành nhân tử: a) x 3 +8y 3 b) 3x 2 -9x c) x 3 +5x 2 -6x d) 3x 2 -3xy-5x+5y

<p>a.x³ +8y^3&nbsp; =(x+2y)(x²-2xy+4y²)</p><p>b.3x²-9x=3x(x-3)</p><p>c.x³+5x²-6x=x(x²+5x-6)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =x(x²+2x+3x-6)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =x[x(x-2)+3(x-2)]</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =x(x+2)(x+3)</p><p>d.3x²-3xy-5x+5y=(3x²-3xy)-(5x-5y)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=3x(x-y)-5(x-y)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=(x-y)(3x-5)</p><p>làm theo cảm tính thui nhé.chúc bạn học tốt</p>