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下列一元二次方程中,没有实数根的是A.x2+2x-1=0B.x2+2x+2=0C.D.-x...
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下列一元二次方程中,没有实数根的是( )
A.x
2+2x-1=0
B.x
2+2
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAC/SURBVDhPzZNBEsUQEETnXBaOY+8m1g5iOwfJ
wlH6ZwRJ8ItklVSpQmn9picIg4+IsDT+iUf77R59XMz2zEB7xIw7x44e2nI+zrASZl5PxZG5OskN
0WtQdp+Ku0ClhFXnVsyWUKp45nyrH3ggjvDaokQnRIRgchtMJZRfs8fV8KVHpVUhhDR1iqDcluat
WBKu3ZIDe2iyPi0SweF+FUtA/SM58G98ZscV9xH28A1cNzenQMq9E8tF4v7KuVCsin81ApctPDAe
KwAAAABJRU5ErkJggg==
)
x+2=0
C.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAFcAAAAZCAYAAABEmrJwAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
D.-x
2+x+2=0
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