内容正文:
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1.(2020
5678
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1
x-槡 2&'() x)*+,-.
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A.x≥2 B.x>2 C.x≥-2 D.x>-2
2.(2020
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( )
A.槡20 B.槡5 C.槡
7
8
D. 1.槡 2
3.
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A.1
3
B.1
3x
C.x
3
D.±x
3
4.(2020
=>78
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( )
A.6 B.5 C.4 D.2
5.
BCDE%槡2(x-1)>槡52-槡18)5FGH. ( )
A.2 B.3 C.4 D.5
6.
I6
1
2
a 4槡a+16a
a
槡9 -4a
2 1
槡a)+JK. ( )
A.
LH
B.
MH
C.
NLH
D.
NMH
7.
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A^WXY)_`]
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槡A.179 B. 65 C.
179
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Lb).
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A.5槡
3
4
= 5
4槡
3
B. a槡b 槡÷ ab=
1
b
(a>0,b>0)
C. 9槡
5
7
×3槡
5
7
= 3
7槡
35
D. 482÷32槡
2 × (48+32)(48-32槡 )= 槡6 70
9.
cd
x2+y2 =24,(槡 槡x+ y)
4+(槡 槡x- y)
4 =180,
A
xy=
( )
A.8 B.9 C.10 D.11
10.(2020
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e
a1 =1+
1
12
+1
22
,a2 =1+
1
22
+1
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a3 =1+
1
32
+1
42
,…,an =1+
1
n2
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(n+1)2
,
f2
n
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A
a槡1 +
a槡2 + a槡3 +… +