
Aloe班12月19日小练习
Authored by 芸 卢
Mathematics
8th Grade
Used 1+ times

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11 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
计算:(﹣2m^4)^3=( )
﹣6m^7
﹣8m^7
﹣2m^12
﹣8m^12
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列运算正确的是( )
a^2•a^3=a^6
a^8﹣a^2=a^6
(a^2)^3=a^6
a^6÷a^2=a^3
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列等式由左边至右边的变形中,属于因式分解的是( )
x^2﹣3x+1=x(x﹣3)+1
(x+2)(x﹣2)=x^2﹣1
x^2+2x=x(x+2)
x^2+6x﹣9=(x+3)^2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列从左到右的变形,是因式分解的是( )
(x+4)(x﹣4)=x^2﹣16
x^2+2x+1=x(x+2)+1
x^2+1=x(x+1x)
a^2b+ab^2=ab(a+b)
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
x≠0
x≠2
x<2
x>2
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
最近科学家发现了一种病毒的长度约为0.00000456毫米,则数据0.00000456用科学记数法表示为( )
4.56×10^﹣5
0.456×10^﹣7
4.56×10^﹣6
4.56×10^﹣8
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
x=0时,分式值为0
x=3时,分式无意义
x<0时,分式值为负数
x>3时,分式的值为正数
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