F.4 Ch.2 一元二次方程（二）
Authored by 67 YI
Mathematics
10th Grade
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20 questions
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1.
MULTIPLE SELECT QUESTION
1 min • 5 pts
已知一元二次方程式：
欲運用公式求解前，可以先用判別式確認解的狀況，請問下列何者正確？(複選題)
若
方程式有相異兩解
(相異兩根)
若
方程式有相同兩解
(重根)
若
則此方程式必有解
若
方程式無解
(無實根)
2.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
請問 ，解的狀態為何？
無解
重根
兩相異解
3.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
若 ，解的狀態為重根，請問b為何？
2
-2
0
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
考慮
。
有兩個相異實根
有一個二重實根
沒有實根
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
考慮
。
有兩個相異實根
有一個二重實根
沒有實根
6.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
求 x2 + 7x + 2 = 0 的兩根之和及兩根之積。
兩根之和= -7, 兩根之積=2
兩根之和= -7, 兩根之積= -2
兩根之和= 7, 兩根之積=2
兩根之和= 7, 兩根之積=- 2
7.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
若 α 和 β 是方程x2 + 3x – 4 = 0的根，求α + β 的值。
3
– 3
4
– 4
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