发布时间 : 星期四 文章2019年全国各地中考数学试卷试题分类汇编更新完毕开始阅读81ace4b87f21af45b307e87101f69e314232faed
=7?32
2
0
43. (2018江苏无锡,19(1),4分) (?1) ? 16 + (?2); 【答案】(1)原式 = 1 ? 4 + 1 …………………(3分) = ?2 ………………………(4分) 44. (2018湖北黄石,16,7分)计算:(-2018)+(
-1
0
22)
-2?2-2cos60
0
2【答案】解:原式=1+2+=22-2
-2-2×1
245. (2018广东肇庆,16,6分)计算:2?1?【答案】解:原式= 1?3?2?1
229?2cos60?
= 7?1
2 = 5
246. (2018湖南永州,17,6分)计算:2sin45??|?【答案】解:原式=2?12|?8?()?1
32?2?22?3=2?2?22?3=3 21-2
47. (2018江苏盐城,19(1),4分)计算:( 3 ) - ( )
2
0
+ tan45°;
【答案】解原式=1-4+1=-2.
48. (2018山东东营,18(1),3分)计算:
1(?1)2011??7?9?(7??)0?()?1
5【答案】解:原式=?1?7?3?5?0
49. (20011江苏镇江,18(1),4分) (1)计算:sin45°
?13?8; 222-?2=2. 22答案:(1)原式=50. (2018内蒙古乌兰察布,20,7分) 计算:
8?3tan300?1?2??2011???0
0【答案】8?3tan300?1?2??2011???2?3?3?(2?1)?1 3
?2?22?1?2?1?1
=2?1
?11?51. (2018重庆市潼南,17,6分)计算:9 +|-2|+????3?+(-
1)
2018
. 答
案
】
解
:
原
式
=3+2+3
-
【1
------------------4分 = ------------------6分
52.(2018广东中山,11,6分)计算:(【解】原式=1+32?222011?1)0?18sin450?22
7
-4
=0
53. (2018广东湛江21,6分)计算:解:原式=3?1?2?4.
54. (2018贵州安顺,19,8分)计算:
?1?12?????2??19?(??2011)??|?2|
?tan60??3?8?3?2
【答案】原式=23?2?3?2?2?3=2 .
55. (2018湖南湘潭市,17,6分)(本题满分6分)
计算:2?1?(??2011)0?2cos45o.
【答案】解:2?1?(??2011)0?2cos45??1211?1?2???1?1? 222256. (2018湖北荆州,17,6分)(本题满分6分)计算:
?1?12????|2?23| ?2??1【答案】解:原式=2
3?2?(23?2)?0