文档介绍：综合练习一元二次方程的解法 C2.??????? x 2?2x?5?0?,???????( ) A.(x?1) 2?6 B ?(x?2) 2?9 C.(x?1) 2?6 D ?(x?2) 2?9 C 3.?????? x(x?2)?2?x???( ) A.?1??? B?2??? C?1?2??? D?? 1?2 DBA 6.?x 2?20?3x 2?20x?5?????,则 x的值是( ) B ? ,? D ? 7.??? x 2?x?0????? x 1,x 2(x 1<x 2),?x 2?x 1?____ ? 8.(2014 ·襄阳)??? a??????? x 2?5x?m?0????,?a??????? x 2?5x?m?0????,?a???____ ? 9.??????????????? x 2?7x?12?0???,?????__________ ? D15 5?4 11.??????????(1)2( x?1) 2? ??? x 1? ,x 2?? (2)4 x 2?3x?2?0?(3) x 2?2x?288 ?0??? x 1?16?x 2?? 18 (4) x 2?1?3x?3. ?? x 1?? 1?x 2?4 ????????x 2?10x ?36?11?????? x 2?10x ?25? 0??(x?5) 2?0???? x 1?x 2?5??? x?5?? x 2?10x ?36 ?5 2?50?36?11 16??? A?2x 2?4x?1?B?x 2?2x?4???? A?B??????????? A?B?(x?1) 2? 2>0 ,? A>B