问题
解答题
计算: (1)-16+23+(-17)-(-7); (2)(-
(3)(-
(4)-14+(1-0.5)×
|
答案
(1)-16+23+(-17)-(-7)
=-16+23-17+7
=-33+30
=-3;
(2)(-
)+(-1 8
)-(-1 4
)-(+3 8
)-(-1 2
)3 4
=-
+1 8
-3 8
+1 4
-3 4 1 2
=(-
+1 8
)-3 8
+1 4
-3 4 1 2
=
-3 4 1 2
=
;1 4
(3)(-
+1 2
-3 4
)×(-16)5 8
=(-
)×(-16)+1 2
×(-16)-3 4
×(-16)5 8
=8-12+10
=18-12
=6;
(4)-14+(1-0.5)×
×〔2-(-3)2〕1 3
=-1+
×1 2
×(2-9)1 3
=-1+7 6
=
.1 6