若2x平方+1与4x平方-2x-5互为相反数,则x的值为A:-1或2/3 B:1或-2/3 C:1或-3/2 D:1或3/2

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若2x平方+1与4x平方-2x-5互为相反数,则x的值为A:-1或2/3B:1或-2/3C:1或-3/2D:1或3/2若2x平方+1与4x平方-2x-5互为相反数,则x的值为A:-1或2/3B:1或-

若2x平方+1与4x平方-2x-5互为相反数,则x的值为A:-1或2/3 B:1或-2/3 C:1或-3/2 D:1或3/2
若2x平方+1与4x平方-2x-5互为相反数,则x的值为
A:-1或2/3 B:1或-2/3 C:1或-3/2 D:1或3/2

若2x平方+1与4x平方-2x-5互为相反数,则x的值为A:-1或2/3 B:1或-2/3 C:1或-3/2 D:1或3/2
4x平方-2x-5+2x平方+1=0
3X^2-X-2=0
X=-2/3
X=1
选择:B

选B
2x^2+1+4x^2-2x-55=0
6x^2-2x-4=0
3x^2-x-2=0
(3x+2)(x-1)=0
x=-2/3 or x=1
选B

B:1或-2/3
2x平方+1与4x平方-2x-5互为相反数
则2x平方+1+4x平方-2x-5=0
6x平方-2x-4=0
3x平方-x-2=0
(3x+2)(x-1)=0
x=-2/3或x=1

若2x平方+1与4x平方-2x-5互为相反数,则x的值为: B:1或-2/3

答案是:B.

选B,(2x^2+1)+(4x^2-2x-5=)0
故6X^2-2x-4=0
3x^2-x-2=0
(3x+2)(x-1)=0
故x=1或-2/3