计算题:(1)-9+12-(-3)+8(2)-5+6÷(-2)×13;(3)(-1)2008-54×(56-49+13)(4)-14-(1-0.5)×13×[2-(-3)2].-数学

题目简介

计算题:(1)-9+12-(-3)+8(2)-5+6÷(-2)×13;(3)(-1)2008-54×(56-49+13)(4)-14-(1-0.5)×13×[2-(-3)2].-数学

题目详情

计算题:
(1)-9+12-(-3)+8
(2)-5+6÷(-2)×
1
3

(3)(-1)2008-54×(
5
6
-
4
9
+
1
3
)

(4)-14-(1-0.5)×
1
3
×[2-(-3)2]
题型:解答题难度:中档来源:不详

答案

(1)-9+12-(-3)+8
=-9+12+3+8
=14;

(2)-5+6÷(-2)×class="stub"1
3

=-5-3×class="stub"1
3

=-5-1
=-6;

(3)(-1)2008-54×(class="stub"5
6
-class="stub"4
9
+class="stub"1
3
)

=1-54×class="stub"5
6
+54×class="stub"4
9
-54×class="stub"1
3

=1-45+24-18
=-38;

(4)-14-(1-0.5)×class="stub"1
3
×[2-(-3)2]

=-1-class="stub"1
2
×class="stub"1
3
×[2-9]
=1-class="stub"1
6
×(-7)
=-1+class="stub"7
6

=class="stub"1
6

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