(2x^4-3x^3+6x^2+7x-4b)÷(x-2)怎么算?
问题描述:
(2x^4-3x^3+6x^2+7x-4b)÷(x-2)怎么算?
求结果,题应该没错……
求具体一点,我可看不懂……
=[2x^3(x-2)+x^3 这一步是怎么搞得?对不起我不太聪明……
答
用长除法.(2x^4-3x^3+6x^2+7x-4b)/(x-2)=[2x^3(x-2)+x^3+6x^2+7x-4b]/(x-2)=2x^3+(x^3+6x^2+7x-4b)/(x-2)=2x^3+[x^2(x-2)+8x^2+7x-4b]/(x-2)=2x^3+x^2+(8x^2+7x-4b)/(x-2)=2x^3+x^2+[8x(x-2)+23x-4b]/(x-2)=2x^3+x^2...