
计算题:(1)-9+12-(-3)+8 (2)-5+6÷(-2)×13;...
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)...
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].
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(1)-9+12-(-3)+8
=-9+12+3+8
=14;
(2)-5+6÷(-2)×
=-5-3×
=-5-1
=-6;
(3)(-1)2008-54×(
-
+
)
=1-54×
+54×
-54×
=1-45+24-18
=-38;
(4)-14-(1-0.5)×
×[2-(-3)2]
=-1-
×
×[2-9]
=1-
×(-7)
=-1+
=
.
=-9+12+3+8
=14;
(2)-5+6÷(-2)×
1 |
3 |
=-5-3×
1 |
3 |
=-5-1
=-6;
(3)(-1)2008-54×(
5 |
6 |
4 |
9 |
1 |
3 |
=1-54×
5 |
6 |
4 |
9 |
1 |
3 |
=1-45+24-18
=-38;
(4)-14-(1-0.5)×
1 |
3 |
=-1-
1 |
2 |
1 |
3 |
=1-
1 |
6 |
=-1+
7 |
6 |
=
1 |
6 |
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