(1)5x^2-5x-60=多少 (2)2X^3-8X^2-24x=多少 (3)2a^2b^2+14ab-60=多少 (4)x^3-8x^2y-20xy^2
问题描述:
(1)5x^2-5x-60=多少 (2)2X^3-8X^2-24x=多少 (3)2a^2b^2+14ab-60=多少 (4)x^3-8x^2y-20xy^2
答
(1)5x^2-5x-60=5(x²-x-12)=5(x+3)(x-4)(2)2X^3-8X^2-24x=2x(x²-4x-12)=2(x-6)(x+2)(3)2a^2b^2+14ab-60=2(a²b²+7ab-30)=2(ab+10)(ab-3)(4)x^3-8x^2y-20xy^2=x(x²-8xy-20y²)=x(x+2...