内容正文:
!17"# 《/0().》89
【
!"#$
】
()<=+8
1.'(H")*#& (C )
A.犪3·犪4=犪12 B.(犪3)2=犪5
C.(3犪2)3=27犪6 D.犪6÷犪3=犪2
2.'("<?,)*#& (D )
A.3.14×10-3=0.000314
B.(
1
3
)
-2
=
1
32
=
1
9
C.(狓2狔
3)5÷(狓狔
2)10=狓狔
5
D.(0.0001)0=(9999)0
3.!":
(1)狓3·狓狀-1-狓狀-2·狓4+狓狀+2;
!
:
"#=狓狀+2-狓狀-2+4+狓狀+2
=狓狀+2;
(2)(犿-狀)2·(狀-犿)2÷(狀-犿)3;
!
:
"#=(狀-犿)4÷(狀-犿)3
=狀-犿;
(3)(-2-4)-1 + (3-π)
0 + (-2
1
2
)
2020
×(
2
5
)
2021
.
!
:
"#=-16+1+
2
5
=-14
3
5
.
【
!"#,
】
DI)*?
4.(1)BC狓2+3狓+5#D.7,WX3狓2+9狓
-2#D& (C )
A.0 B.2 C.4 D.6
(2)/(狓-犪)(狓+犫)=狓2+犕狓+犖,0犕、犖
üw.
(A )
A.犕=犫-犪,犖=-犪犫
B.犕=犫-犪,犖=犪犫
C.犕=犪-犫,犖=-犪犫
D.犕=犪+犫,犖=-犪犫
5.!":
(1)(9狓2-12狓3)÷(-3狓)2;
!
:
"#=(9狓2-12狓3)÷(9狓2)
=1-
4
3
狓;
(2)(3狓+1)(2狓-1)-2狓(
1
2
狓-1).
!
:
"#=6狓2-3狓+2狓-1-狓2+2狓
=5狓2+狓-1.
【
!"#2
】
*+NI
6.(1)µ¡�¤¤<!")*#& (B )
A.(2狓-3)2=4狓2+12狓-9
B.(4狓+1)2=16狓2+8狓+1
C.(犪+犫)(犪+犫)=犪2+犫2
D.(2犿+3)(2犿-3)=4犿2-3
(2)BC狔
2+犿狔+1&KÇÝZ<,0犿 #
D&
(B )
A.2 B.±2 C.1 D.±1
7.!":
(1)1232-122×124;
!
:
"#=1232-(1232-1)
=1;
(2)3.76542+0.4692×3.7654+0.23462;
!
:
"#=(3.7654+0.2346)2
=16;
(3)狓( )+1 2- 狓( )-1 狓( )+2 ;
!
:
"#= 狓2+2狓( )+1 - 狓2+狓( )-2
=狓+3;
(4)2狓+3狔( )+5 2狓+3狔( )-5 ;
!
:
"#=(2狓+3狔)
2-52
=4狓2+12狓狔+9狔
2-25;
(5)(狓+3狔)
2·(狓-3狔)
2.
!
:
"#=(狓2-9狔
2)2
=狓4-18狓2狔
2+81狔
4
.
·33·
8.(1)V%(2犪+2犫-3)(2犪+2犫+3)=40,0犪
+犫#D. (C )
A.
7
2
B.-
7
2
C.±
7
2
D.±3
(2)| } (狓+狔+狕)
2 - (-狓+狔+狕)
2 +
(狓-狔+狕)
2-(狓+狔-狕)
2
#$%&
(D )
A.4狔狕 B.8狓狔 C.4狓狔-4狔狕 D.8狓狕
9.(1)BC25犪·52犫=56,4犫÷4犮=4,0�9<犪2
+犪犫+3犮D& 6 ;
(2)BC狓2+3狓-5=0,0狓(狓+1)(狓+2)
(狓+3)#D& 35 ;
(3)(狓+2)狓+5=1,狓= -5�-1�-3 .
10.fgij4Y*lm:��B®C2,KÇ
ÝZ¤<,1¡Ý++��;#+"y¥
¦
,
ï,�ü@6b�9ÜP<-,1¡º
�;<¥¦
,
�V
:2犪(犪+犫)=2犪2+2犪犫Í
,1¡�①#+"y¥¦.
(1)�2`�②I¥¦#�9ÜP<;
(2)�2`�③I¥¦#�9ÜP<.
!
:(1)(2犪+犫)(犪+犫)=2犪2+3犪犫+犫2;
(2)(2犪+犫)(犪+2犫)=2犪2+5犪犫+2犫2.
11.BC(狓-狔)
2=9,狓2+狔
2=5,=[狓(狓2狔
2-狓狔)-
狔(狓
2-狓3狔)]÷狓
2
狔#D.
!
:
"#=(狓3狔
2-狓2狔-狓
2
狔+狓
3
狔
2)÷狓2狔
=(2狓3狔
2-2狓2狔)÷狓
2
狔=2狓狔-2,
∵(狓-狔)
2=狓2+狔
2-2狓狔=9,
狓2+狔
2=5,
∴2狓狔=-4,
("#=-4-2=-6.
12.=�9<5狓2-4狓狔+狔
2+6狓+25#³p
D.
!
:5狓2-4狓