若2x²+1与4x²-2x-5的值互为相反数,则X的值是?A.-1或2/3 B.1或-2/3 C.1或-3/2 D.1或3/2写的详细点,思路也写出来,急

若2x²+1与4x²-2x-5的值互为相反数,则X的值是?A.-1或2/3 B.1或-2/3 C.1或-3/2 D.1或3/2写的详细点,思路也写出来,急
若2x²+1与4x²-2x-5的值互为相反数,则X的值是?A.-1或2/3 B.1或-2/3 C.1或-3/2 D.1或3/2
写的详细点,思路也写出来,急

若2x²+1与4x²-2x-5的值互为相反数,则X的值是?A.-1或2/3 B.1或-2/3 C.1或-3/2 D.1或3/2写的详细点,思路也写出来,急
若2x²+1与4x²-2x-5的值互为相反数,
则2x²+1+4x²-2x-5=0
6x²-2x-4=0
3x²-x-2=0
（3x+2）（x-1）=0
x1= -2/3 x=1
选择 B.1或-2/3

若2x²+1与4x²-2x-5的值互为相反数，
则2x²+1+4x²-2x-5=0
6x²-2x-4=0
(6x+4)(x-1)=0
则x=-4/6或x=1
所以x=-2/3或x=1
所以选B