内容正文:
书书书
!"#$
(
%&'(
)
2019~2020
)*
+,-*.
/
19~26
0
《
!"#
》
$%&'()*+
1.B; 2.C; 3.B.
4.
!"
:{
1
2,2
1
5,7,1,-(-4),…};
#"
:{-23,-0.01,+(-1),…};
$#%"
:{7,1,-(-4),0,…};
&"
:{-23,
1
2,-0.01,2
1
5,…}.
5.C; 6.C; 7.<,<,>;
8.(1)1,-2.5;(2)5
'
-3;(3)0.5;
9.A; 10.14' -
1
4.
11.
()*
,
+
a+b=0,cd=1,|x|=2.
,-
x2 =4.
,-./
=4-1+0-1=2.
12.A; 13.(1)>,(2)<.
14.
"0123
.|-3|>-(-1)> 12 >0>-2.5>
-22 >-5.
15.B; 16.-13,5,7,-49; 17.102.4;
18.D; 19.70400;
20.D; 21.C; 22.B; 23.12.
24.(1)-19; (2)-11; (3)-37; (4)-3.
25.(1)
4
;
(2)(-3)+(+8)+(-9)+(+10)+(+4)+(-6)+
(-2)=2(km).
5
:
6789
A
:
2km.
(3)
;<=>?@ABC
:|-3|+|+8|+|-9|+
|+10|+|+4|+|-6|+|-2|=42(km),42×0.3×7.2=
90.72(
!
).
5
:
;<=>7DEFGHIJ
90.72
K
.
26.-0.7938; 27.450.
《
!"#
》
,'-./
0
、
"#
1 2 3 4 5 6 7 8 9 10
$%
B B A C C B C D A A
1
、11.12; 12.6; 13.(-65)
2-5,4220;
14.7.8; 15.A,C,B; 16.7;
17.2,(-,4); 18.7:00,23:00,18:00.
2
、19.
#%"
:{-(-2)2,-|-2|,…};
#&"
:{
(-2)3
3
,…};
!&"
:{
3
4,0.86,…}.
(2)
"0123
.-3<-1.5<+(-1)<0<-(-23)
<212 <|-3|.
20.(1)8; (2)-18.
21.
()*
,
+
|2-b|+|a-b+4|=0.
,-
2-b=0,a-b+4=0.
,-
b=2,a=-2.
,-
ab-2019=-2×2-2019=-2023.
22.(1)+5+(-8)+10+(-6)+(-3)+11+(-9)
=0.
5
:
LMNOPQRLSTHNU
.
(2)
VCLMNWHNU@9WXYC
:5km,|5-8|
=|-3|=3(km),|-3+10|=7(km),|7-6|=1(km),
|1-3|=|-2|=2(km),|-2+11|=9(km),|9-9|=
0(km),
,-LMNWHNUOZ[
9km.
(3)(|+5|+|-8|+|+10|+|-6|+|-3|+|+11
|+
+,-*.
/
19~26
0
|-9|)÷4=13(
&
).
5
:
LMNE\]R
13̂
_`
.
23.(1)
abcd@AB[
12̂
efgh
.
(2)
iT
N
jk@"[
a.
①lTMmTNno8,a-2+a=12,p+a=7;
②lTMmTNqo8,2-a-a=12,p+a=-5.
,-T
N
jk@"[
-5
'
7.
(3)
labrsncd8
,MN=2-(-5)=7;
labr
sqcd8
,MN=7-2=5.
,-T
M
tT
N
uv@9W[
5
'
7.
《
!"#
》
,'3./
0
、
"#
1 2 3 4 5 6 7 8 9 10
$%
A C D D D A D A A D
1
、11.-23,-
8
27; 12.9.08×10
6;
13.4; 14.6; 15.0; 16.q;
17.-3; 18.-19102,(-1)
n+1·
2n-1
n2+2
.
2
、19.(1)m=3,n=4,a=-125;
(2)(-a+m)÷n=[-(-125)+3]÷4=32.
20.(1)0; (2)-219314; (3)-2.
21.(1)<,<,>;
(2)|a+b|-|a+c|+|b-c|=-(a+b)+(a+c)+
(b-c)=-a-b+a+c+b-c=