内容正文:
!11"# 16451+30(1)
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(B )
A.(犪+犫)(犪-犫)=犪2-犫2
B.(犪-犫)2=犪2-2犪犫+犫2
C.(犪+犫)2=犪2+2犪犫+犫2
D.(犪+犫)2=(犪-犫)2+4犪犫
2./犪、犫、犮&)9,'(><,ª���#�;
�7¡V�QR#&
(D )
A.(犫+犮)2=犫2+2犫犮+犮2
B.犪(犫+犮)=犪犫+犪犮
C.(犪+犫+犮)2=犪2+犫2+犮2+2犪犫+2犫犮+2犪犮
D.犪2+2犪犫=犪(犪+2犫)
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3.(1)!"(犮-犪)2 PU (D )
A.犮2-犪2 B.犪2+2犪犮+犮2
C.犮2+犪2 D.犮2-2犪犮+犪2
(2)!"(-犪-犫)2 PU (B )
A.犪2+犫2 B.犪2+2犪犫+犫2
C.犪2-犫2 D.犪2-2犪犫+犫2
(3)!"(狓+2)2#$%.狓2+□狓+4,0
“□”?#9. (D )
A.-2 B.2
C.-4 D.4
(4)/(7狓-犪)2=49狓2-犫狓+9,|犪+犫|aD
.�
(D )
A.18 B.24
C.39 D.45
4.(1)/(狓-1)2=2,0�9<狓2-2狓+5#D
. 6 ;
(2)/犪+犫-3=0,0犪2+2犪犫+犫2-6#D
. 3 .
5.R��#9��9<,jP<36:
(1)狓2+10狓+ 25=(狓+5)
2
;
(2)犿2-8犿+ 16=(犿-4)
2
;
(3)狓2+
4
5
狓狔+
4
25
狔
2
=(狓+
2
5
狔)
2
.
6.!":
(1)(2犪+3犫)2;
!
:
"#=(2犪)2+2·2犪·3犫+(3犫)2
=4犪2+12犪犫+9犫2;
(2)(-2犿+狀)2;
!
:
"#=(-2犿)2-2·2犿·狀+狀2
=4犿2-4犿狀+狀2;
(3)(-2犿-狀)2.
!
:
"#=(-2犿)2+2·(-2犿)·(-狀)+(-狀)2
=4犿2+4犿狀+狀2.
7.!":
(1)(2犪+犫)2-(2犪-犫)2;
!
:
"#=(4犪2+4犪犫+犫2)-(4犪2-4犪犫+犫2)
=8犪
b.
·12·
(2)(3狓-5)2-(2狓+7)2.
!
:
"#=9狓2-30狓+25-(4狓2+28狓+49)
=9狓2-30狓+25-4狓2-28狓-49
=5狓2-58狓-24.
8.YZ[:(狓+
1
2
)
2
-(狓-
1
2
)(狓+
1
2
)=1.
!
:
�-'
:狓2+狓+
1
4
-狓2+
1
4
=1,
!'
:狓=
1
2
.
9.V�,6r��.犪+犫#Ã;ÄÅ,ª?Æ
y��üw.犪N犫#h7Ã,=·'#Ä
Å#+".
!
:π(
犪+犫
2
)
2
-π(
犪
2
)
2
-π(
犫
2
)
2
=
1
2
π犪犫.
10.(1)BC犪2+犫2=3,犪+犫=2,WX犪犫#D
.
(B )
A.-
1
2
B.
1
2
C.-2 D.2
(2)/狀.)_9,0(2狀+1)2-(2狀-1)2
(B )
A.6E7ñ6_¶
B.6E7ñ8_¶
C.6E7ñ10_¶
D.6E7ñ12_¶
11.(1)/5�9<狓2-2狓-3|.(狓-犿)2+
犽#;<,A?犿,犽.�9,0犿+犽= -
3 ;
(2)/狓2-2(犽-1)狓+9&KÇÝZ<,0犽#
D. 4�-2 .
12. 479犪,犫,犮,犱³32¬、2(,hp>È
6ÉÊ�Ë-3
犪,犫
犮,犱
,
EF
犪,犫
犮,犱
=犪犱-
犫犮,� Ì - � Í Î 0 2 Ï ¬ ( <. /
狓+1,狓-1
狓-1,狓+1
=12,0狓= 3 .
13.!":
(1)(2狓-1)(4狓2-1)(2狓+1);
!
:
"#=(4狓2-1)(4狓2-1)=16狓4-8狓2+1;
(2)(狓+狔)
2-4(狓+狔)(狓-狔)+4(狓-狔)
2;
!
:
"#=狓2+2狓狔+狔
2-4狓2+4狔
2+4狓2-8狓狔+4狔
2
=狓2-6狓狔+9狔
2;
(3)4(犪+2)2-7(犪+3)(犪-3)+3(犪-1)2.
!
:
"#=4(犪2+4犪+4)-7(犪2-9)+3(犪2-2犪+1)
=4犪2+16犪+16-7犪2+63+3犪2-6犪+3
=10犪+82.
14.|}=D:
(2狓+5狔)
2+(2狓-5狔)