多项式6mX²+4nxy+2x+2xy-X²+y-4不含二次项,求6m-2n+2的值
问题描述:
多项式6mX²+4nxy+2x+2xy-X²+y-4不含二次项,求6m-2n+2的值
答
整理:6mX²+4nxy+2x+2xy-X²+y-4
=(6m-1)x^2+(4n+2)xy+2x+y-4
因为不含二次项,
所以6m-1=0,
4n+2=0,
所以m=1/6,n=-1/2
所以6m-2n+2=1+1+2=4