内容正文:
78+(92
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1.(2019·
X6
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y=-x2+bx+4
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(-2,n)
A
(4,n)
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A.-2 B.-4 C.2 D.4
2.(2019·
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y=-(x+1)2+2
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C.y1>y2>2 D.y2>y1>2
3.(2019·
P+
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4.(2019·
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y=ax+a
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C D
5.(2019·
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y=x2-ax+b
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b=-4
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C.
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6.(2019·
F7
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HI,-&@
y=ax2+bx+c
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C.a-b+c<0 D.2a+b=0
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7.(2019·
JKL
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y=2x2
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( B )
A.y=2(x+2)2+3 B.y=2(x-2)2+3
C.y=2(x-2)2-3 D.y=2(x+2)2-3
8.(2019·
MN
)
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y=(x+5)(x-3)
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y=
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( B )
A.
wÝÒ²
2
J´µ
B.
wÞÒ²
2
J´µ
C.
wÝÒ²
8
J´µ
D.
wÞÒ²
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9.(2019·
z{
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C:y=12(x-1)
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2槡3
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4槡3
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2019-23,2018-23,2017-23,
2016-23,2015-23,2014-23,
2013-23)
10.(
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y
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x=1
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( A )
x -7 -6 -5 -4 -3 -2
y -27-13 -3 3 5 3
A.-27 B.-13 C.-3 D.5
11.(2019·
P+
)
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d46
O(0,0).
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12.(2019·
Q+
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HI
m>0,
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x
)*+,-
#$
(x+1)(x-2)-m=0
)G6
x1,x2(x1<
x2),/!"Øð:;)& ( A )
A.x1<-1<2<x2 B.-1<x1<2<x2
C.-1<x1<x2<2 D.x1<-1<x2<2
13.(2019·
RS
)
�¸A
y=x2+bx+3
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6?A
x=1.
.'(
x
)*+,-#$
x2+
bx+3-t=0(t
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( A )
A.2≤t<11 B.t≥2
C.6<t<11 D.2≤t<6
14.(
TU-=
)
MN
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y=ax2
1?A
y=
bx+c
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A(-2,4),
B(1,1),
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x1 =
-2,x2=1 .
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14
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15
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15.(2019·
V�
)
MN
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y=ax2+c
1?A
y=mx+n
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A(-1,p),B