解:(﹣2)﹣|=4﹣(2﹣=4﹣2+=3.
﹣
2
﹣2|﹣2cos45°+(3﹣π), )﹣2×+1,
00
+1,
19.(2019·益阳)计算: 4sin60??(?201)9?()?|?23|.
12?1解:4sin60??(?2019)0?()?1?|?23|
12?4?3?1?2?23?23?1?2?23=-1. 219.(2019·长沙)计算:?2?()?6?3?2cos60?. 【解】原式=2+2-2-2×
3. (2019·衢州)计算:|-3|+(π-3)0- 4+tan45°.
12?11=2-1=1。 2解:原式=3+1-2+1…4分(每项1分) =3. …6分
1?1()4. (2019·金华)计算:|-3|-2tan60°+12+3
解:原式=3-23+23+3=6.
19.(2019·株洲)计算:?3???2cos30?.
0【解题过程】原式=3+1-2?17.(2019·淮安)计算:
3=1 202(1)4?tan45??(1?2);(2)ab(3a-2b)+2ab .
0【解题过程】解:(1)4?tan45??(1?2)=2?1?1=0;
(2)ab(3a-2b)+2ab ?3ab-2ab+2ab?3ab.
5. (2019·湖州)计算:(-2)3+解:原式=-8+4=-4.
6.(2019·自贡)计算:|-3|-4sin45+ +(π-3). 解:原式= - × + +
0
0
222221×8. 2= - +2 + = .
?1?7. (2019·眉山)计算:????4?3?3??2??0?6sin45??18.
解:原式=9-1+6×
2-32=8+32-32=8. 28. (2019·凉山)计算:tan45° + (3-2)-(-0
1-2
) + ︱3-2︱. 2解:原式=1+1-(-2)2+2-3=2-4+2-3=-3.
?1?0?9.(2019·乐山)计算:????2019????2sin30.
?2??2?1?2?解:原式
?112?2?1?1?2.
(π-3.14)(-)?327-8 10. (2019·达州) 计算:
2.1-230(π-3.14)(-)?27-82 解:
=1-4+3-22 =-22.
11. (2019·巴中)计算(-
01-212
)+(3-?)0+|3-2|+2sin60°-8. 2113解:原式=4+1+2-3+3-22=4-22.
?1?12. (2019·济宁) 计算:6sin60??12????3?2018
?2?.
6?3?23?1?2018?32
0解:原式==33?23?3?1?2018
=2019 .
13. (2019·无锡) (1) ?3?()?1?(2009)0.
33232a?a?(a). (2)
12解:(1)原式=3+2-1=4 . (2)原式=2a6-a6=a6.
14. (2019·岳阳)计算:(2?1)?2sin30??()?(?1)013?12019 .
11(2?1)0?2sin30??()?1?(?1)2019?1?2??3?(?1)?232解:.
15. (2019·怀化) 计算:???2019??4sin60??12??3.
01解:原式=1+4×2-23+3=1+2-23+3=6-23.