问题
解答题
计算 (1)-9+12-(-3)+8 (2)-14-(1-0.5)×
|
答案
(1)-9+12-(-3)+8
=-9+12+3+8
=-9+23
=14;
(2)-14-(1-0.5)×
×[2-(-3)2]1 3
=-1-
×1 2
×[2-9]1 3
=-1-
×1 2
×(-7)1 3
=-1+7 6
=
.1 6
计算 (1)-9+12-(-3)+8 (2)-14-(1-0.5)×
|
(1)-9+12-(-3)+8
=-9+12+3+8
=-9+23
=14;
(2)-14-(1-0.5)×
×[2-(-3)2]1 3
=-1-
×1 2
×[2-9]1 3
=-1-
×1 2
×(-7)1 3
=-1+7 6
=
.1 6