(4)(5)(6)
. . .
【解答】解:(1)原式=23﹣22﹣17+6=﹣10; (2)原式=1××=;
(3)原式=﹣9×+10=﹣15+10=﹣5; (4)原式=(﹣
)×(﹣60)=﹣40+5=﹣35;
(5)原式=﹣4﹣4=﹣8; (6)原式=16﹣30+21=7.
14.计算: (1) (2)(3)(4)
.
【解答】解:(1)原式=﹣﹣﹣=﹣=﹣6
﹣5 ;
(2)原式=(﹣4+16)×(﹣) ==﹣
×(﹣)
;
(3)原式=﹣1﹣××(﹣7) =﹣1+ =;
(4)原式==
×(﹣5+2﹣6)
×(﹣9)
=﹣30. 15.计算
(1)23﹣17﹣(﹣7)+(﹣16) (2)(﹣4)+|﹣8|+(﹣3)3﹣(﹣3) (3)﹣24÷(2)2﹣3×(﹣) (4)×(﹣2)﹣[4÷(﹣)+1]+(﹣1)
3
2
2008
.
【解答】解:(1)23﹣17﹣(﹣7)+(﹣16) =23﹣17+7﹣16 =﹣3
(2)(﹣4)+|﹣8|+(﹣3)3﹣(﹣3) =﹣4+8﹣27+3 =﹣20
(3)﹣24÷(2)2﹣3×(﹣) =﹣24×=﹣=﹣
+
+×
=﹣
(4)×(﹣2)3﹣[4÷(﹣)2+1]+(﹣1)2008. =﹣2﹣(9+1)+1 =﹣11 16.计算
(1)22+(﹣4)+(﹣2)+4 (2)(﹣)++(﹣)+ (3)﹣12+15﹣|﹣7﹣8| (4)1(5)(6)﹣14﹣
.
【解答】解:(1)22+(﹣4)+(﹣2)+4 =22﹣4﹣2+4 =20
(2)(﹣)++(﹣)+ =﹣﹣++ =﹣12+5 =﹣7
(3)﹣12+15﹣|﹣7﹣8| =﹣12+15﹣15 =﹣12 (4)1=1+﹣2+
=2﹣2 =0 (5)
=﹣24×+24×+24× =﹣16+18+4 =6
(6)﹣14﹣=﹣1﹣×(3﹣9) =﹣1+1 =0
17.计算:
(1)12﹣(﹣18)+(﹣12)﹣15 (2)(﹣)﹣(﹣)+(﹣)+ (3)(﹣+)×(﹣24)
(4)﹣14+(﹣2)3×(﹣)﹣(﹣32)
【解答】解:(1)原式=12+18﹣12﹣15=30﹣27=3;
(2)原式=﹣﹣++=﹣1+1=0;
(3)原式=﹣6+12﹣4=2;
(4)原式=﹣1+8×+9 =﹣1+4+9