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二次方程的根的性質

Authored by Tsoi Ming蔡家明

Mathematics

11th Grade

Used 2+ times

二次方程的根的性質
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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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