原式=(x^2+11x+24)(x^2+10x+24)+4x(x^2+11x+24)-4x^2
=(x+3)(x+8)(x+4)(x+6)+4x(x^2+10x+24)
=(x+3)(x+8)(x+4)(x+6)+4x(x+4)(x+6)
=(x+4)(x+6)(x^2+15x+24)我看不懂....这样也可以 用十字相乘 原式=(x^2+11x+24)(x^2+11x+24+3x)-4x^2=(x^2+11x+24)^2+3x(x^2+11x+24)-4x^2=(x^2+11x+24-x)(x^2+11x+24+4x)=(x^2+10x+24)(x^2+15x+24)我完全不懂,..是你算错吗???