
计算:(1)-27-(-12);(2)?12+3÷12×2?(?3)2;(3)[212?(38+16?34)×24]÷5×(?1)2013
计算:(1)-27-(-12);(2)?12+3÷12×2?(?3)2;(3)[212?(38+16?34)×24]÷5×(?1)2013....
计算:(1)-27-(-12);(2)?12+3÷12×2?(?3)2;(3)[212?(38+16?34)×24]÷5×(?1)2013.
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(1)-27-(-12)=-27+12=-15;
(2)?12+3÷
×2?(?3)2
=-1+6×2-9
=-1+12-9
=2;
(3)[2
?(
+
?
)×24]÷5×(?1)2013
=[2
-
×24-
×24+
×24]÷5×(-1)
=[2
-9-
+4+18]÷5×(-1)
=15
÷5×(-1)
=-3
.
(2)?12+3÷
1 |
2 |
=-1+6×2-9
=-1+12-9
=2;
(3)[2
1 |
2 |
3 |
8 |
1 |
6 |
3 |
4 |
=[2
1 |
2 |
3 |
8 |
1 |
6 |
3 |
4 |
=[2
1 |
2 |
1 |
6 |
=15
1 |
3 |
=-3
1 |
15 |
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