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利用公式解解一元二次方程式(8上4-2)

Authored by 詹盛仁 詹盛仁

Mathematics

8th Grade

Used 18+ times

利用公式解解一元二次方程式(8上4-2)
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10 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

求一元二次方程式的解

 x2+8x+16=0x^2+8x+16=0  

 4()-4\left(重根\right)  

 4()4\left(重根\right)  

 8()8\left(重根\right)  

 8()-8\left(重根\right)  

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

求一元二次方程式的解

 x2+x6=0x^2+x-6=0  

 3()-3\left(重根\right)  

 2    32\ \ \ 和\ -3  

 3()3\left(重根\right)  

 2       3-2\ \ \ 和\ \ \ \ 3  

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

求一元二次方程式的解

 3x2+x+2=03x^2+x+2=0  

 2()2\left(重根\right)  

 無實根  

 3    23\ \ \ 和\ -2  

 2       3-2\ \ \ 和\ \ \ \ 3  

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

求一元二次方程式的解

 3x2x1=03x^2-x-1=0  

 1±136\frac{-1\pm\sqrt{13}}{6}  

 1±136\frac{1\pm\sqrt{13}}{6}  

 3    13\ \ \ 和\ -1  

 1±106\frac{1\pm\sqrt{10}}{6}  

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

求一元二次方程式的解

 5x27x+8=05x^2-7x+8=0  

 無實根  

 7±1310\frac{7\pm\sqrt{13}}{10}  

 25    2\frac{2}{5}\ \ \ 和\ -2  

 7±1310\frac{-7\pm\sqrt{13}}{10}  

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

求一元二次方程式的解

 2x2+7x4=0-2x^2+7x-4=0  

 無實根  

 7±174\frac{7\pm\sqrt{17}}{4}  

 12    4\frac{1}{2}\ \ \ 和\ -4  

 7±174\frac{-7\pm\sqrt{17}}{4}  

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

求一元二次方程式的解

 4x2+5x2=0-4x^2+5x-2=0  

 無實根  

 5±178\frac{-5\pm\sqrt{17}}{8}  

 12    2\frac{1}{2}\ \ \ 和\ -2  

 5±178\frac{5\pm\sqrt{17}}{8}  

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