若多项式2x^3+ax-y+6与多项式2bx^2-3x+5y-1与x的取值无关无关,求a^2b-(6ab+3a^2b)+(5ab+2a^2b)的值.
问题描述:
若多项式2x^3+ax-y+6与多项式2bx^2-3x+5y-1与x的取值无关无关,求a^2b-(6ab+3a^2b)+(5ab+2a^2b)的值.
答
题目有问题,看看是不是写错了次*多项式2x^2+ax-y+6与多项式2bx^2-3x+5y-1与x的取值无关无关,求a^2b-(6ab+3a^2b)+(5ab+2a^2b)的值。这次对了2x^2+ax-y+6+2bx^2-3x+5y-1=(2+2b)x²+(a-3)x+4y+5,值与x的取值无关无关,则2+2b=0,a-3=0则a=3,b=-1a^2b-(6ab+3a^2b)+(5ab+2a^2b)=a²b-6ab-3a²b+5ab+2a²b=-ab=-1×3×(-1)=3