当x=1.5时,求2x^2-((x^3+3x^2-4x-12)/(x^2+x-6))(x-2)的值
问题描述:
当x=1.5时,求2x^2-((x^3+3x^2-4x-12)/(x^2+x-6))(x-2)的值
答
x³+3x²-4x-12=(x³+3x²)-(4x+12)=x²(x+3)-4(x+3)=(x+3)(x²-4)=(x+3)(x-2)(x+2)(x²+x-6)(x-2)=(x+3)(x-2)²原式=2x²-[(x³+3x²-4x-12)]...