内容正文:
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7
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1
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230
1.C; 2.A; 3.C; 4.D;
5.C; 6.B; 7.D; 8.A.
45
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A
xOy
/BC'
|c|.
2.
)
(x,y,z)
DE()/FG)45H
(-x,-y,-z).
3.
I
A(0,0,a),
7
32+22+(a-1)槡
2 =槡13,JK a
=1.
4.8
L
,
9:H
(3,2,2),(3,2,-2),(3,-2,2),(3,-2,
-2),(-3,2,2),(-3,2,-2),(-3,-2,2),(-3,-2,-
2).
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M,N
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OJBC
.
6.
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P
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x+y=1
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AB= (x+1)2+(-x+2)2+(0-2)槡
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= 2 x-( )12
2
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x= 1
2
W
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XKYZ[
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1
2
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1
2
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2 =5.
10.
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P,Q
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P
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2,
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2 =槡20,
EH!
10+y槡
2 =槡20,�K y=±槡10.
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230
1.A; 2.C; 3.C; 4.C; 5.C;
6.A; 7.A; 8.C; 9.A; 10.A.
45
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3
4
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P
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∠MPN=90°,-&KPN·KPM =
9
7-a
× 1
1-a
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�K
a=
4;
V)
P
P
y
tWI
P(0,b),
8' ∠