2021中考数学真题知识点分类汇编(含答案)-无理数与实数3(实数的运算解答题)(46题,含答案)
展开2021中考数学真题知识点分类汇编-无理数与实数3(实数的运算解答题)(46题,含答案)
一.实数的运算(共51小题)
1.(2021•阿坝州)(1)计算:23+﹣2cos45°;
(2)解不等式组:.
2.(2021•内江)计算:6sin45°﹣|1﹣|﹣×(π﹣2021)0﹣()﹣2.
3.(2021•济南)计算:.
4.(2021•沈阳)计算:(π﹣2021)0﹣3tan30°+|1﹣|+()﹣2.
5.(2021•河池)计算:+4﹣1﹣()2+|﹣|.
6.(2021•德阳)计算:(﹣1)3+|﹣1|﹣()﹣2+2cos45°﹣.
7.(2021•兴安盟)计算:﹣2﹣2﹣2sin60°+|1﹣|﹣.
8.(2021•百色)计算:(π﹣1)0+|﹣2|﹣()﹣1+tan60°.
9.(2021•湘潭)计算:|﹣2|﹣(π﹣2)0+()﹣1﹣4tan45°.
10.(2021•郴州)计算:(2021﹣π)0﹣|2﹣|+()﹣1•tan60°.
11.(2021•梧州)计算:(﹣1)2+(﹣8)÷4+﹣(﹣2021)0.
12.(2021•湘西州)计算:(﹣2)0﹣﹣|﹣5|+4sin45°.
13.(2021•常州)计算:﹣(﹣1)2﹣(π﹣1)0+2﹣1.
14.(2021•大庆)计算|﹣2|+2sin45°﹣(﹣1)2.
15.(2021•张家界)计算:.
16.(2021•通辽)计算:()﹣1+(π﹣3)0﹣2cos30°+|3﹣|.
17.(2021•贺州)计算:+(﹣1)0+|π﹣2|﹣tan30°.
18.(2021•柳州)计算:|﹣3|﹣+1.
19.(2021•福建)计算:.
20.(2021•玉林)计算:+(4﹣π)0+(﹣1)﹣1﹣6sin30°.
21.(2021•十堰)计算:cos45°+()﹣1﹣|﹣3|.
22.(2021•盐城)计算:()﹣1+(﹣1)0﹣.
23.(2021•济宁)计算:|﹣1|+cos45°﹣()﹣1+.
24.(2021•北京)计算:2sin60°++|﹣5|﹣(π+)0.
25.(2021•宿迁)计算:4sin45°.
26.(2021•衢州)计算:+()0﹣|﹣3|+2cos60°.
27.(2021•菏泽)计算:(2021﹣π)0﹣|3﹣|+4cos30°﹣()﹣1.
28.(2021•常德)计算:20210+3﹣1•﹣sin45°.
29.(2021•上海)计算:9+|1﹣|﹣2﹣1×.
30.(2021•株洲)计算:|﹣2|+sin60°﹣2﹣1.
31.(2021•岳阳)计算:(﹣1)2021+|﹣2|+4sin30°﹣(﹣π)0.
32.(2021•广安)计算:(3.14﹣π)0﹣+|1﹣|+4sin60°.
33.(2021•达州)计算:﹣12+(π﹣2021)0+2sin60°﹣|1﹣|.
34.(2021•怀化)计算:.
35.(2021•新疆)计算:.
36.(2021•陕西)计算:(﹣)0+|1﹣|﹣.
37.(2021•黄冈)计算:0.
38.(2021•邵阳)计算:(2021﹣π)0﹣|﹣2|﹣tan60°.
39.(2021•眉山)计算:(4﹣)0﹣3tan60°﹣(﹣)﹣1+.
40.(2021•苏州)计算:+|﹣2|﹣32.
41.(2021•台州)计算:|﹣2|+﹣.
42.(2021•扬州)计算或化简:
(1)(﹣)0+|﹣3|+tan60°.
(2)(a+b)÷(+).
43.(2021•江西)(1)计算:(﹣1)2﹣(π﹣2021)0+|﹣|;
(2)如图,在△ABC中,∠A=40°,BE平分∠ABC交AC于点E,ED⊥AB于点D
44.(2021•嘉峪关)计算:(2021﹣π)0+()﹣1﹣2cos45°.
45.(2021•云南)计算:(﹣3)2++(﹣1)0﹣2﹣1+×(﹣6).
46.(2021•金华)计算:(﹣1)2021+﹣4sin45°+|﹣2|.
47.(2021•连云港)计算:+|﹣6|﹣22.
48.(2021•丽水)计算:|﹣2021|+(﹣3)0﹣.
49.(2021•遂宁)计算:(﹣)﹣1+tan60°﹣|2﹣|+(π﹣3)0﹣.
50.(2021•泸州)计算:()0+()﹣1﹣(﹣4)+2cos30°.
51.(2021•自贡)计算:﹣|﹣7|+(2﹣)0.
参考答案与试题解析
一.实数的运算(共51小题)
1.(2021•阿坝州)(1)计算:23+﹣2cos45°;
(2)解不等式组:.
【解答】解:(1)原式=23+﹣2cos45°
=8+7﹣2×
=8+4﹣
=5+;
(2),
不等式①的解集是:x>﹣5,
不等式②的解集是:x≤﹣1,
∴原不等式组的解集是:﹣4<x≤﹣1.
2.(2021•内江)计算:6sin45°﹣|1﹣|﹣×(π﹣2021)0﹣()﹣2.
【解答】解:原式=6×﹣(×5﹣4
=3﹣+1﹣7
=﹣3.
3.(2021•济南)计算:.
【解答】解:
=4+4+3﹣2×8
=8﹣2
=2.
4.(2021•沈阳)计算:(π﹣2021)0﹣3tan30°+|1﹣|+()﹣2.
【解答】解:(π﹣2021)0﹣3tan30°+|5﹣|+()﹣2
=1﹣2×+﹣1+4
=5﹣+﹣4+4
=4.
5.(2021•河池)计算:+4﹣1﹣()2+|﹣|.
【解答】解:原式=2+﹣+
=3.
6.(2021•德阳)计算:(﹣1)3+|﹣1|﹣()﹣2+2cos45°﹣.
【解答】解:原式=﹣1+﹣5﹣4+2×
=﹣7+﹣1﹣8+
=﹣3.
7.(2021•兴安盟)计算:﹣2﹣2﹣2sin60°+|1﹣|﹣.
【解答】解:原式=
=﹣﹣+﹣1﹣
=.
8.(2021•百色)计算:(π﹣1)0+|﹣2|﹣()﹣1+tan60°.
【解答】解:原式=1+2﹣﹣3+
=3.
9.(2021•湘潭)计算:|﹣2|﹣(π﹣2)0+()﹣1﹣4tan45°.
【解答】解:原式=2﹣1+2﹣4×1
=4﹣1+3﹣6
=0.
10.(2021•郴州)计算:(2021﹣π)0﹣|2﹣|+()﹣1•tan60°.
【解答】解:原式=1﹣(2﹣2)+2×
=1﹣2+2+2
=3.
11.(2021•梧州)计算:(﹣1)2+(﹣8)÷4+﹣(﹣2021)0.
【解答】解:原式=1﹣2+7﹣1
=0.
12.(2021•湘西州)计算:(﹣2)0﹣﹣|﹣5|+4sin45°.
【解答】解:原式=1﹣2﹣5+4×﹣8+2.
13.(2021•常州)计算:﹣(﹣1)2﹣(π﹣1)0+2﹣1.
【解答】解:原式=2﹣1﹣4+
=.
14.(2021•大庆)计算|﹣2|+2sin45°﹣(﹣1)2.
【解答】解:原式=2﹣+5×
=5﹣+﹣2
=1.
15.(2021•张家界)计算:.
【解答】解:原式=
=.
16.(2021•通辽)计算:()﹣1+(π﹣3)0﹣2cos30°+|3﹣|.
【解答】解:原式=2+1﹣5×+5
=﹣
=.
17.(2021•贺州)计算:+(﹣1)0+|π﹣2|﹣tan30°.
【解答】解:原式=2+1+π﹣7﹣×
=2+1+π﹣4﹣1
=π.
18.(2021•柳州)计算:|﹣3|﹣+1.
【解答】解:原式=3﹣3+6
=1.
19.(2021•福建)计算:.
【解答】解:原式=2+5﹣
=.
20.(2021•玉林)计算:+(4﹣π)0+(﹣1)﹣1﹣6sin30°.
【解答】解:原式=4+1﹣6﹣6×
=4+1﹣4﹣3
=1.
21.(2021•十堰)计算:cos45°+()﹣1﹣|﹣3|.
【解答】解:原式=+3﹣3=6.
22.(2021•盐城)计算:()﹣1+(﹣1)0﹣.
【解答】解:原式=3+1﹣6
=2.
23.(2021•济宁)计算:|﹣1|+cos45°﹣()﹣1+.
【解答】解:原式=﹣1+﹣
=﹣4+2
=7﹣1.
24.(2021•北京)计算:2sin60°++|﹣5|﹣(π+)0.
【解答】解:原式=2×+2
=+2
=3+4.
25.(2021•宿迁)计算:4sin45°.
【解答】解:原式=1+2﹣4×
=1+2﹣2
=6.
26.(2021•衢州)计算:+()0﹣|﹣3|+2cos60°.
【解答】解:原式=3+1﹣7+2×
=2.
27.(2021•菏泽)计算:(2021﹣π)0﹣|3﹣|+4cos30°﹣()﹣1.
【解答】解:原式=1﹣(2﹣3)+4×
=1﹣8+3+7
=0.
28.(2021•常德)计算:20210+3﹣1•﹣sin45°.
【解答】解:20210+3﹣6•﹣sin45°
=8+×7﹣
=1+1﹣7
=1.
29.(2021•上海)计算:9+|1﹣|﹣2﹣1×.
【解答】解:+|1﹣﹣5×
=3
=6
=7.
30.(2021•株洲)计算:|﹣2|+sin60°﹣2﹣1.
【解答】解:原式=2+×﹣
=2+﹣
=5.
31.(2021•岳阳)计算:(﹣1)2021+|﹣2|+4sin30°﹣(﹣π)0.
【解答】解:原式=﹣1+2+3×﹣2=﹣1+2+3﹣1=2.
32.(2021•广安)计算:(3.14﹣π)0﹣+|1﹣|+4sin60°.
【解答】解:原式=
=
=0.
33.(2021•达州)计算:﹣12+(π﹣2021)0+2sin60°﹣|1﹣|.
【解答】解:原式=﹣1+1+2×﹣(
=﹣1+1+﹣+1
=6.
34.(2021•怀化)计算:.
【解答】解:原式=1﹣2+9+4×
=1﹣7+9+8
=11.
35.(2021•新疆)计算:.
【解答】解:原式=1+3﹣3﹣1
=0.
36.(2021•陕西)计算:(﹣)0+|1﹣|﹣.
【解答】解:原式=1+﹣5﹣2
=﹣.
37.(2021•黄冈)计算:0.
【解答】解:原式=﹣1﹣3×
=﹣1﹣
=3.
38.(2021•邵阳)计算:(2021﹣π)0﹣|﹣2|﹣tan60°.
【解答】解:原式=1﹣(2﹣)﹣
=1﹣7+﹣
=﹣8.
39.(2021•眉山)计算:(4﹣)0﹣3tan60°﹣(﹣)﹣1+.
【解答】解:原式=1﹣3×﹣(﹣2)+
=1﹣+2+
=3﹣.
40.(2021•苏州)计算:+|﹣2|﹣32.
【解答】解:原式=2+2﹣2
=﹣5.
41.(2021•台州)计算:|﹣2|+﹣.
【解答】解:原式=2+2﹣
=2+.
42.(2021•扬州)计算或化简:
(1)(﹣)0+|﹣3|+tan60°.
(2)(a+b)÷(+).
【解答】解:(1)原式=
=4;
(2)原式=
=
=ab.
43.(2021•江西)(1)计算:(﹣1)2﹣(π﹣2021)0+|﹣|;
(2)如图,在△ABC中,∠A=40°,BE平分∠ABC交AC于点E,ED⊥AB于点D
【解答】(1)解:原式=1﹣1+
=;
(2)证明:∵BE平分∠ABC交AC于点E,
∴∠ABE=∠ABC=,
∵∠A=40°,
∴∠A=∠ABE,
∴△ABE为等腰三角形,
∵ED⊥AB,
∴AD=BD.
44.(2021•嘉峪关)计算:(2021﹣π)0+()﹣1﹣2cos45°.
【解答】解:原式=1+2﹣2×
=6﹣.
45.(2021•云南)计算:(﹣3)2++(﹣1)0﹣2﹣1+×(﹣6).
【解答】解:原式=9++1﹣
=6.
46.(2021•金华)计算:(﹣1)2021+﹣4sin45°+|﹣2|.
【解答】解:原式=﹣1+﹣4×
=﹣1+2﹣2
=6.
47.(2021•连云港)计算:+|﹣6|﹣22.
【解答】解:原式=2+6﹣4
=4.
48.(2021•丽水)计算:|﹣2021|+(﹣3)0﹣.
【解答】解:|﹣2021|+(﹣3)0﹣
=2021+1﹣2
=2020.
49.(2021•遂宁)计算:(﹣)﹣1+tan60°﹣|2﹣|+(π﹣3)0﹣.
【解答】解:原式=﹣2+﹣(5﹣
=﹣5+﹣2+
=﹣3.
50.(2021•泸州)计算:()0+()﹣1﹣(﹣4)+2cos30°.
【解答】解:()0+()﹣1﹣(﹣4)+8cos30°.
=1+8+4+3
=12.
51.(2021•自贡)计算:﹣|﹣7|+(2﹣)0.
【解答】解:原式=5﹣7+4=﹣1.
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