20.下列一元二次方程中,没有实数根的是( )
0 283028 283036 283042 283046 283052 283054 283058 283064 283066 283072 283078 283082 283084 283088 283094 283096 283102 283106 283108 283112 283114 283118 283120 283122 283123 283124 283126 283127 283128 283130 283132 283136 283138 283142 283144 283148 283154 283156 283162 283166 283168 283172 283178 283184 283186 283192 283196 283198 283204 283208 283214 283222 366461
| A. | x2-6x+9=0 | B. | 4x2+2=0 | C. | 5x2-4x=0 | D. | 3x2-4x+1=0 |