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.如果
. 
分别为（ ）
. 分别为（ ） A: ；1 |
| B:；-1 |
| C: -；1 |
| D: -；-1 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOaWueeoi+S4pOi+ueWQjOmZpOS7peS6jA==
- 提示2：IOenu+mhue+8m+WGjemFjeaWuQ==
- 提示3：IOacgOWQjuS4pOi+ueWQjOaXtuW8gOaUvg==
- 答案：Qg==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.
求二次根式
中字母
的取值范围（ ）
| A: R |
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6aaW5YWI6KKr5byA5pa55pWw5aSn5LqO6Zu2PC9wPg==
- 提示2：PHA+6KaB6YWN5pa5PC9wPg==
- 提示3：PHA+5YaN6KeC5a+f6KKr5byA5pa55pWwPC9wPg==
- 答案：QQ==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.
化简√6−2√5=()
| A: √5−1 |
| B: −√5+1 |
| C: −√5−1 |
| D: √5+1 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6KeC5a+f6aKY55uu57uT5p6E5a+75om+5LiA5qyh6aG55LiO5LqM5qyh6aG5PC9wPg==
- 提示2：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
- 答案：RA==
PGRpdj7op6PvvJo8c3BhbiBjbGFzcz0ibWF0aHF1aWxsLXJlbmRlcmVkLW1hdGgiIHN0eWxlPSJmb250LXNpemU6MjBweDsiPjxzcGFuIGNsYXNzPSJ0ZXh0YXJlYSI+PHRleHRhcmVhIGRhdGEtY2tlLWVkaXRhYmxlPSIxIiBjb250ZW50ZWRpdGFibGU9ImZhbHNlIj48L3RleHRhcmVhPjwvc3Bhbj48c3BhbiBjbGFzcz0ibm9uLWxlYWYiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI2NCI+PHNwYW4gc3R5bGU9InRyYW5zZm9ybTogc2NhbGUoMSwgMS4wMDQxNyk7IiBjbGFzcz0ic2NhbGVkIHNxcnQtcHJlZml4Ij7iiJo8L3NwYW4+PHNwYW4gY2xhc3M9Im5vbi1sZWFmIHNxcnQtc3RlbSIgbWF0aHF1aWxsLWJsb2NrLWlkPSI2NSI+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjY3Ij42PC9zcGFuPjxzcGFuIGNsYXNzPSJiaW5hcnktb3BlcmF0b3IiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI2OCI+4oiSPC9zcGFuPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI2OSI+Mjwvc3Bhbj48c3BhbiBjbGFzcz0ibm9uLWxlYWYiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI3MCI+PHNwYW4gc3R5bGU9InRyYW5zZm9ybTogc2NhbGUoMSwgMC45MDQxNjcpOyIgY2xhc3M9InNjYWxlZCBzcXJ0LXByZWZpeCI+4oiaPC9zcGFuPjxzcGFuIGNsYXNzPSJub24tbGVhZiBzcXJ0LXN0ZW0iIG1hdGhxdWlsbC1ibG9jay1pZD0iNzEiPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI3MyI+NTwvc3Bhbj48L3NwYW4+PC9zcGFuPjwvc3Bhbj48L3NwYW4+PC9zcGFuPjxzcGFuPiZuYnNwOzwvc3Bhbj48L2Rpdj48ZGl2Pu+8nTxzcGFuIGNsYXNzPSJtYXRocXVpbGwtcmVuZGVyZWQtbWF0aCIgc3R5bGU9ImZvbnQtc2l6ZToyMHB4OyI+PHNwYW4gY2xhc3M9InRleHRhcmVhIj48dGV4dGFyZWEgZGF0YS1ja2UtZWRpdGFibGU9IjEiIGNvbnRlbnRlZGl0YWJsZT0iZmFsc2UiPjwvdGV4dGFyZWE+PC9zcGFuPjxzcGFuIGNsYXNzPSJub24tbGVhZiIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjI4Ij48c3BhbiBzdHlsZT0idHJhbnNmb3JtOiBzY2FsZSgxLCAxLjAwNDE3KTsiIGNsYXNzPSJzY2FsZWQgc3FydC1wcmVmaXgiPuKImjwvc3Bhbj48c3BhbiBjbGFzcz0ibm9uLWxlYWYgc3FydC1zdGVtIiBtYXRocXVpbGwtYmxvY2staWQ9IjI5Ij48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNjAiPjU8L3NwYW4+PHNwYW4gY2xhc3M9ImJpbmFyeS1vcGVyYXRvciIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjUyIj4tPC9zcGFuPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI1MyI+Mjwvc3Bhbj48c3BhbiBjbGFzcz0ibm9uLWxlYWYiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI1NCI+PHNwYW4gc3R5bGU9InRyYW5zZm9ybTogc2NhbGUoMSwgMC45MDQxNjcpOyIgY2xhc3M9InNjYWxlZCBzcXJ0LXByZWZpeCI+4oiaPC9zcGFuPjxzcGFuIGNsYXNzPSJub24tbGVhZiBzcXJ0LXN0ZW0iIG1hdGhxdWlsbC1ibG9jay1pZD0iNTUiPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI1NyI+NTwvc3Bhbj48L3NwYW4+PC9zcGFuPjxzcGFuIGNsYXNzPSJiaW5hcnktb3BlcmF0b3IiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI1OCI+Kzwvc3Bhbj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNTkiPjE8L3NwYW4+PC9zcGFuPjwvc3Bhbj48L3NwYW4+PHNwYW4+Jm5ic3A7PC9zcGFuPjwvZGl2PjxkaXY+77ydPHNwYW4gY2xhc3M9Im1hdGhxdWlsbC1yZW5kZXJlZC1tYXRoIiBzdHlsZT0iZm9udC1zaXplOjIwcHg7Ij48c3BhbiBjbGFzcz0idGV4dGFyZWEiPjx0ZXh0YXJlYSBkYXRhLWNrZS1lZGl0YWJsZT0iMSIgY29udGVudGVkaXRhYmxlPSJmYWxzZSI+PC90ZXh0YXJlYT48L3NwYW4+PHNwYW4gY2xhc3M9Im5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMjgiPjxzcGFuIHN0eWxlPSJ0cmFuc2Zvcm06IHNjYWxlKDEsIDEuMjU0MTcpOyIgY2xhc3M9InNjYWxlZCBzcXJ0LXByZWZpeCI+4oiaPC9zcGFuPjxzcGFuIGNsYXNzPSJub24tbGVhZiBzcXJ0LXN0ZW0iIG1hdGhxdWlsbC1ibG9jay1pZD0iMjkiPjxzcGFuIGNsYXNzPSJub24tbGVhZiIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjMxIj48c3BhbiBzdHlsZT0idHJhbnNmb3JtOiBzY2FsZSgxLjAyLCAxLjE1NSk7IiBjbGFzcz0ic2NhbGVkIHBhcmVuIj4oPC9zcGFuPjxzcGFuIGNsYXNzPSJub24tbGVhZiIgbWF0aHF1aWxsLWJsb2NrLWlkPSIzMiI+PHNwYW4gY2xhc3M9Im5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMzQiPjxzcGFuIHN0eWxlPSJ0cmFuc2Zvcm06IHNjYWxlKDEsIDAuOTA0MTY3KTsiIGNsYXNzPSJzY2FsZWQgc3FydC1wcmVmaXgiPuKImjwvc3Bhbj48c3BhbiBjbGFzcz0ibm9uLWxlYWYgc3FydC1zdGVtIiBtYXRocXVpbGwtYmxvY2staWQ9IjM1Ij48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMzciPjU8L3NwYW4+PC9zcGFuPjwvc3Bhbj48L3NwYW4+PHNwYW4gc3R5bGU9InRyYW5zZm9ybTogc2NhbGUoMS4wMiwgMS4xNTUpOyIgY2xhc3M9InNjYWxlZCBwYXJlbiI+KTwvc3Bhbj48L3NwYW4+PHN1cCBjbGFzcz0ibm9uLWxlYWYiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI0MCIgbWF0aHF1aWxsLWJsb2NrLWlkPSI0MSI+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjQzIj4yPC9zcGFuPjwvc3VwPjxzcGFuIGNsYXNzPSJiaW5hcnktb3BlcmF0b3IiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI1MiI+LTwvc3Bhbj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNTMiPjI8L3NwYW4+PHNwYW4gY2xhc3M9Im5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNTQiPjxzcGFuIHN0eWxlPSJ0cmFuc2Zvcm06IHNjYWxlKDEsIDAuOTA0MTY3KTsiIGNsYXNzPSJzY2FsZWQgc3FydC1wcmVmaXgiPuKImjwvc3Bhbj48c3BhbiBjbGFzcz0ibm9uLWxlYWYgc3FydC1zdGVtIiBtYXRocXVpbGwtYmxvY2staWQ9IjU1Ij48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNTciPjU8L3NwYW4+PC9zcGFuPjwvc3Bhbj48c3BhbiBjbGFzcz0iYmluYXJ5LW9wZXJhdG9yIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNTgiPis8L3NwYW4+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjU5Ij4xPC9zcGFuPjwvc3Bhbj48L3NwYW4+PC9zcGFuPjxzcGFuPiZuYnNwOzwvc3Bhbj48L2Rpdj48ZGl2Pu+8nTxzcGFuIGNsYXNzPSJtYXRocXVpbGwtcmVuZGVyZWQtbWF0aCIgc3R5bGU9ImZvbnQtc2l6ZToyMHB4OyI+PHNwYW4gY2xhc3M9InRleHRhcmVhIj48dGV4dGFyZWEgZGF0YS1ja2UtZWRpdGFibGU9IjEiIGNvbnRlbnRlZGl0YWJsZT0iZmFsc2UiPjwvdGV4dGFyZWE+PC9zcGFuPjxzcGFuIGNsYXNzPSJub24tbGVhZiIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjQiPjxzcGFuIHN0eWxlPSJ0cmFuc2Zvcm06IHNjYWxlKDEsIDEuMjU0MTcpOyIgY2xhc3M9InNjYWxlZCBzcXJ0LXByZWZpeCI+4oiaPC9zcGFuPjxzcGFuIGNsYXNzPSJub24tbGVhZiBzcXJ0LXN0ZW0iIG1hdGhxdWlsbC1ibG9jay1pZD0iNSI+PHNwYW4gY2xhc3M9Im5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNyI+PHNwYW4gc3R5bGU9InRyYW5zZm9ybTogc2NhbGUoMS4wMiwgMS4xNTUpOyIgY2xhc3M9InNjYWxlZCBwYXJlbiI+KDwvc3Bhbj48c3BhbiBjbGFzcz0ibm9uLWxlYWYiIG1hdGhxdWlsbC1ibG9jay1pZD0iOCI+PHNwYW4gY2xhc3M9Im5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMTAiPjxzcGFuIHN0eWxlPSJ0cmFuc2Zvcm06IHNjYWxlKDEs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本课配套习题挑战模式4/5
单选题
难度系数：
4.
解方程
,x;y 分别为（ ）
| A: -2;1 |
| B: -2;-1 |
| C: 2;-1 |
| D: 2;1 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6Jm954S26Kej5LqM5YWD5LqM5qyh5pa556iL5Zyo6K++56iL5qCH5YeG5Lit5LiN5bGe5LqO6ICD6K+V5YaF5a6577yM5pys6aKY55yL5LiK5Y675piv5LiA5Liq5LqM5YWD5LqM5qyh5pa556iL55qE6Zeu6aKY77yM5a6e6LSo5LiK5a6D5piv5LiA5Liq6Z2e6LSf5pWw6Zeu6aKYPC9wPg==
- 提示2：PHA+5bCG5YWz5LqOeO+8m3nnmoTkuozmrKHpobnliIbliKvphY3mlrk8L3A+
- 答案：QQ==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.
代数式x2﹣4x+5的最小值为（）
| A: 0 |
| B: 1 |
| C: 5 |
| D: 没有最小值 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5Yip55So6YWN5pa55rOV77yM55yL5aW957O75pWwPC9wPg==
- 答案：Qg==
PGRpdj7op6PvvJriiLV4PHN1cD4yPC9zdXA+77mjNHgrNT14PHN1cD4yPC9zdXA+77mjNHgrNO+5ozQrNT3vvIh477mjMu+8iTxzdXA+Mjwvc3VwPisxPC9kaXY+PGRpdj7iiLXvvIh477mjMu+8iTxzdXA+Mjwvc3VwPuKJpTDvvIw8L2Rpdj48ZGl2PuKItO+8iHjvuaMy77yJPHN1cD4yPC9zdXA+KzHiiaUx77yMPC9kaXY+PGRpdj7iiLTku6PmlbDlvI94PHN1cD4yPC9zdXA+77mjNHgrNeeahOacgOWwj+WAvOS4ujEuPC9kaXY+
