内容正文:
!7"# 14/0()*(2)
【
!"#$
】
H1I*JK1I
1.(1)!":狓(狓2-1)= (B )
A.狓3-1 B.狓3-狓
C.狓3+狓 D.狓2-狓
(2)52犪(犪犫-犫+犮)|}h× (D )
A.2犪2犫-犪犫+犪犮 B.2犪2-2犪犫+2犪犮
C.2犪2犫+2犪犫+2犪犮 D.2犪2犫-2犪犫+2犪犮
(3)|}(-3狊+
1
2
狋)·(-7狊狋2)= (B )
A.21狊2狋2-14狊狋3 B.21狊2狋2-
7
2
狊狋3
C.-21狊2狋2+14狊狋3 D.-21狊2狋2+
7
2
狊狋
2.(1)!"-3狓·(狓-2狔)= -3狓
2+6狓狔 ;
(2)!":(3狓2狔-5狓狔)·(-4狓狔
2)=
-12狓
3
狔
3+20狓2狔
3
.
3.!":
(1)2犪犫2·(3犪2犫-2犪犫-1);
!
:
"#=6犪3犫3-4犪2犫3-2犪犫2;
(2)-3狓·(
1
3
狓2狔
3+2狔
2-1).
!
:
"#=-狓3狔
3-6狓狔
2+3狓.
【
!"#,
】
+8)34
4.(1)'(!")*#& (D )
A.-犪(-犪+犫)=犪2+犪犫
B.狓(-3狓2+狓-1)=-3狓3+狓2-1
C.5犿-2犿(犿-1)=3犿2-3犿
D.(狔-2狔
2+1)(-3狔)=6狔
3-3狔
2-3狔
(2)ij(狓2+犪狓+1)(-6狓3)#kl<?�m
狓4�,0犪QPU (D )
A.6 B.-1 C.
1
6
D.0
(3)BC狓(狓-2)=3,0�9<2狓2-4狓-7#
D.
(D )
A.6 B.-4 C.13 D.-1
(4)V%67no;#8pß.2狓2狔+狓狔-
狔
2,
8p�#¶.6狓狔,WXº7no;#+"
.
(A )
A.6狓3狔
2+3狓2狔
2-3狓狔
3
B.6狓2狔
2+3狓狔-3狓狔
2
C.6狓2狔
2+3狓2狔
2-狔
2
D.6狓2狔+3狓
2
狔
2
5.2狓2狔·犃=6狓
2
狔
2-4狓3狔
2,
0犃= 3狔-2狓狔 .
6.!":(-3狓狔
2)2(2狓-狔
2)= 18狓
3
狔
4-9狓2狔
6
.
7.!":
(1)(4犪-犫)(-2犫)2;
!
:
"#=(4犪-犫)·4犫2
=16犪犫2-4犫3;
(2)2犿狀(-2犿狀)2-3狀(犿狀+犿2狀)-犿狀2;
!
:
"#=2犿狀·4犿2狀2-3犿狀2-3犿2狀2-犿狀2
=8犿3狀3-3犿狀2-3犿2狀2-犿狀2
=8犿3狀3-4犿狀2-3犿2狀2;
(3)狓(狓2-狓-1)+3(狓2+狓)-
1
3
狓(3狓2+6狓).
!
:
"#=狓3-狓2-狓+3狓2+3狓-狓3-2狓2
=2狓
.
·31·
8.BC@O9犪、犫、犮[q|犪-犫-3|+(犫+1)
2+|犮-1|
=0,=(-3犪犫)·(犪2犮-6犫2犮)#D.
!
:
"#=-3犪3犫犮+18犪犫3犮,
$|犪-犫-3|+(犫+1)2+|犮-1|=0,
'犪-犫-3=0,犫+1=0,犮-1=0
∴犪=2,犫=-1,犮=1,
"#=-3×23×(-1)×1+18×2×(-1)3×1
=24-36=-12.
9.YZ[:2狓(狓+1)-(3狓-2)狓=1-狓2.
!
:2狓(狓+1)-(3狓-2)狓=1-狓2,
���'
:2狓2+2狓-3狓2+2狓=1-狓2,
�-'
:4狓=1,
!'
:狓=
1
4
.
10.(1)'(>m?,!")*#79& (B )
①(犪-3犫)(-6犪)=-6犪
2+18犪犫;
②(-
1
3
狓2狔)(-9狓狔+2)=3狓
3
狔
2+2;
③(-4犪犫)(-
1
2
犪2犫)=2犪3犫2;
④(-
1
2
犪犫)(-
2
3
犪犫2-2犪犫)=
1
3
犪犫2-2犪
A.1 B.2 C.3 D.4
(2)BC犪-犫=3,犫-犮=-2,0�9<犪2-犪犮
-犫(犪-犮)#D. (C )
A.4 B.-4 C.3 D.-3
11.(1)!":(狓2狔)
2·(狓狀-1狔
狀+1-狓狀-1狔
狀-1+狓狀狔
狀)
= 狓
狀+3
狔
狀+3-狓狀+3狔
狀+1+狓狀+4狔
狀+2
.
(2)/(犿狓2-狀狓+2)·(-2狓2)-4狓3 #$%
?�m狓4 �J狓3 �,0犿= 0 ,狀= 2
.
(3)/2狓(狓-1)-狓(2狓+3)=15,0狓= -
3 .
12.!":
(1)3狓狔-[狓狔(3狓-2狔)-2狔(狓狔-狓)];
!