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.

题目有问题,看看是不是写错了次方若多项式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