
二次方程的根的性質
Authored by Tsoi Ming蔡家明
Mathematics
11th Grade
Used 2+ times

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6 questions
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1.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
判別式的公式是:
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
兩個相異的實根。
一個二重實根。
沒有實根。
有實根
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
已知某二次方程有兩個相異的實根,以下哪個是正確的判別式範圍。
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
對於 4x2 – 20x + 25 = 0 的判別式,以下哪一項正確。
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
若二次方程 kx2 + 4x – 2 = 0 有一個二重實根,求 k 的值。
2
–2
1
–1
6.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
挑戰題:若二次方程 –4x2 + 8x + (3 – k) = 0 有實根,求 k 值的範圍。
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