(2M-N)X²+3X-2(MX²-NX+6)的取值与X的取值无关 求M,N

(2M-N)X²+3X-2(MX²-NX+6)的取值与X的取值无关 求M,N
(2M-N)X²+3X-2(MX²-NX+6)的取值与X的取值无关 求M,N

(2M-N)X²+3X-2(MX²-NX+6)的取值与X的取值无关 求M,N
-3x^2+mx+nx^2-x+6=（-3+n)x^2+(m-1)x+6
要使取之于x无关,只要-3+n=0,m-1=0,即n=3,m=1