2上 4-2 配方法與公式解
Quiz
•
Mathematics
•
8th Grade
•
Medium
康軒數位 康軒數位
Used 4+ times
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
解方程式2x2+5x-9=0,則x=?
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
下列哪一個二次方程式的兩個解相等(重根)?
x2-10x-25=0
-x2+10x+25=0
-9x2+12x-4=0
9x2-12x-4=0
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
設a、b為方程式2+3x-x2=0的解,則ab的值為多少?
3
-3
2
-2
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
利用配方法解方程式x2+6x-8091=0之兩根,則兩根之差的絕對值為多少?
6
9
180
190
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
若方程式(3x-2)2=196,則此方程式的解為何?
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
已知x的一元二次方程式9x2-6x+2m-5=0有重根a,則下列何者正確?
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
下面是小平以配方法解方程式3x2+5x-1=0的步驟,請問從哪個步驟開始發生錯誤?
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