中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.已知：a2-a-1=0，则代数式（2a-1）2的值是（ ）
| A: 3 |
| B: 4 |
| C: 5 |
| D: 7 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOmmluWFiOeUseW3suefpWE8c3VwPjI8L3N1cD4tYS0xPTDvvIzlj6/lvpfvvJphPHN1cD4yPC9zdXA+LWE9Me+8mw==
- 提示2：IOWGjeaKiuimgeaxgueahOS7o+aVsOW8j+eUqOWujOWFqOW5s+aWueWFrOW8j+WxleW8gO+8jOWxleW8gOWQjuinguWvn+W9ouWKv++8jOWGjeWwhuS4iumdoueahGE8c3VwPjI8L3N1cD4tYT0x5Luj5YWl5Y2z5Y+vLg==
- 答案：Qw==
PGRpdj7op6PvvJriiLVhPHN1cD4yPC9zdXA+LWEtMT0w77yM4oi0YTxzdXA+Mjwvc3VwPi1hPTEg4pGg77yMPGJyPu+8iDJhLTHvvIk8c3VwPjI8L3N1cD48YnI+PTRhPHN1cD4yPC9zdXA+LTRhKzHvvIw8YnI+PTTvvIhhPHN1cD4yPC9zdXA+LWHvvIkrMe+8jDxicj49NMOXMSsx77yMPGJyPj0177yOPGJyPuaVheacrOmimOmAiUPvvI48L2Rpdj4=
本课配套习题挑战模式2/5
单选题
难度系数：
2.若非零实数a、b、c满足4a-2b+c=0，则关于x的一元二次方程ax2+bx+c=0一定有一个根为（ ）
| A: 2 |
| B: -2 |
| C: 0 |
| D: 无法确定 |
一次做对，真牛！
+5奖励规则>
- 提示1：6KeC5a+f5YmN6Z2i55qE6L+Z5Liq562J5byPDQo0YS0yYitjPTDvvIzlkozkuIDlhYPkuozmrKHmlrnnqItheDxzdXA+Mjwvc3VwPitieCtjPTAu5a+55q+UYeOAgWLjgIFj55qE57O75pWw77yM5om+5Ye65YWz57O7
- 提示2：IOWPkeeOsOWPquacieW9kzxpbWcgd2lkdGg9NDMgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvRUQvNkQvckJBQ0ZGTUVXUWZ5LWlfOUFBQUJhanp3Q05rMDgxLnBuZyI+5pe277yM5YmN5ZCO5Lik5Liq562J5byP5LiA5qC377yb5Lmf6K+05piO5LqGPGltZyB3aWR0aD00MyBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9FRC82RC9yQkFDRkZNRVdRZnktaV85QUFBQmFqendDTmswODEucG5nIj7mmK/mlrnnqItheDxzdXA+Mjwvc3VwPitieCtjPTDnmoTop6M=
- 答案：Qg==
PGRpdj7op6PvvJrlvZPmiop4PS0y5Luj5YWl5pa556iLYXg8c3VwPjI8L3N1cD4rYngrYz0w6IO95b6X5Ye6NGEtMmIrYz0w77yMPGJyPuWNs+aWueeoi+S4gOWumuacieS4gOS4quagueS4ung9LTLvvIw8YnI+5pWF6YCJQu+8jjwvZGl2Pg==
本课配套习题挑战模式3/5
单选题
难度系数：
3.若b是方程x2+ax+b=0的一个解，且b≠0，则a+b等于（ ）
| A: -1 |
| B: 1 |
| C: -2 |
| D: 2 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOaKing9YuS7o+WFpeaWueeoi+W+l+WIsGI8c3VwPjI8L3N1cD4rYWIrYj0w77yM
- 提示2：IOW8j+WtkGI8c3VwPjI8L3N1cD4rYWIrYj0w55qE5bem6L656YO95pyJYizlubbkuJTlt7Lnn6XkuK3mnIli4omgMA==
- 提示3：IOaJgOS7pei/meS4quetieW8j+S4pOi+ueWPr+S7peWQjOaXtumZpOS7pWLvvIzkuYvlkI7ljbPlj6/msYLlh7rnrZTmoYg=
- 答案：QQ==
PGRpdj7op6PvvJrmiop4PWLku6PlhaXmlrnnqIvlvpfvvJpiPHN1cD4yPC9zdXA+K2FiK2I9MO+8jDxicj7iiLVi4omgMO+8jDxicj7kuKTovrnpg73pmaTku6Vi5b6X77yaYithKzE9MO+8jDxicj7iiLRhK2I9LTHvvI48YnI+5pWF6YCJQe+8jjwvZGl2Pg==
本课配套习题挑战模式4/5
单选题
难度系数：
4.已知m，n是方程x2-2x-1=0的两根，且（7m2-14m+a）（3n2-6n-7）=8，则a的值等于（ ）
| A: -5 |
| B: 5 |
| C: -9 |
| D: 9 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOWmguaenOS9oOinieW+l+i/memBk+mimOmavueahOivne+8jOmCo+S5iOaIkeaDs+ivtOeahOaYrzrigJzlroPlubbkuI3lg4/kvaDmg7PosaHnmoTpgqPkuYjpmr7igJ3jgII=
- 提示2：IOWPr+WFiOWIhuWIq+aKim3vvIxu5Luj5YWl5pa556iL5b6X5Yiw5YWz5LqObe+8jG7nmoTnrYnlvI8=
- 提示3：IOWIqeeUqOaVtOS9k+aAneaDs+WIhuWIq+axguWHujdtPHN1cD4yPC9zdXA+LTE0beWSjDNuPHN1cD4yPC9zdXA+LTZu77yM5YaN5Luj5YWl5omA5rGC5Luj5pWw5byP5Y2z5Y+v5rGC6Kej77yO
- 答案：Qw==
PGRpdj7op6PvvJriiLVt77yMbuaYr+aWueeoi3g8c3VwPjI8L3N1cD4tMngtMT0w55qE5Lik5qC5PGJyPuKItG08c3VwPjI8L3N1cD4tMm09Me+8jG48c3VwPjI8L3N1cD4tMm49MTxicj7iiLQ3bTxzdXA+Mjwvc3VwPi0xNG09N++8iG08c3VwPjI8L3N1cD4tMm3vvIk9N++8jDNuPHN1cD4yPC9zdXA+LTZuPTPvvIhuPHN1cD4yPC9zdXA+LTJu77yJPTM8YnI+4oi177yIN208c3VwPjI8L3N1cD4tMTRtK2HvvInvvIgzbjxzdXA+Mjwvc3VwPi02bi0377yJPTg8YnI+4oi077yINyth77yJw5fvvIgtNO+8iT04PGJyPuKItGE9LTnvvI48YnI+5pWF6YCJQ++8jjwvZGl2Pg==
本课配套习题挑战模式5/5
单选题
难度系数：
5.
已知下面三个关于x的一元二次方程ax2+bx+c=0，bx2+cx+a=0，cx2+ax+b=0恰好有一个相同的实数根a，则a+b+c的值为（ ）
| A: 0 |
| B: 1 |
| C: 3 |
| D: 不确定 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5oqKeD1h5Luj5YWlM+S4quaWueeoi+W+l+WHumHigKJhPHN1cD4yPC9zdXA+K2JhK2M9MO+8jGJhPHN1cD4yPC9zdXA+K2NhK2E9MO+8jGNhPHN1cD4yPC9zdXA+K2HigKJhK2I9MO+8jDwvcD4=
- 提示2：PHA+M+S4quaWueeoi+ebuOWKoOWNs+WPr+W+l+WHuu+8iGErYitj77yJ77yIYTxzdXA+Mjwvc3VwPithKzHvvIk9MDwvcD4=
- 答案：QQ==
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
