计算:(1)-27+(-32)+(-8)+72 (2)(134-79-5...
计算:(1)-27+(-32)+(-8)+72(2)(134-79-512)×(-36)(3)0.75×(-2)3-[4÷(-23)2+1](4)-14-(1-0.5)÷...
计算:(1)-27+(-32)+(-8)+72 (2)(134-79-512)×(-36)(3)0.75×(-2)3-[4÷(-23)2+1](4)-14-(1-0.5)÷3×[3-(-3)2].
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(1)-27+(-32)+(-8)+72
=-27-32-8+72
=-67+72
=5;
(2)(1
-
-
)×(-36)
=-1
×36+
×36+
×36
=-63+28+15
=-20;
(3)0.75×(-2)3-[4÷(-
)2+1]
=0.75×(-8)-[4÷
+1]
=-6-[9+1]
=-6-10
=-16;
(4)-14-(1-0.5)÷3×[3-(-3)2]
=-1-0.5÷3×[3-9]
=-1+0.5÷3×6
=-1+1
=0.
=-27-32-8+72
=-67+72
=5;
(2)(1
3 |
4 |
7 |
9 |
5 |
12 |
=-1
3 |
4 |
7 |
9 |
5 |
12 |
=-63+28+15
=-20;
(3)0.75×(-2)3-[4÷(-
2 |
3 |
=0.75×(-8)-[4÷
4 |
9 |
=-6-[9+1]
=-6-10
=-16;
(4)-14-(1-0.5)÷3×[3-(-3)2]
=-1-0.5÷3×[3-9]
=-1+0.5÷3×6
=-1+1
=0.
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