
计算(1)(+12)+(-7)-(+15)(2)16?23?(45?815)(3)-12×(1-0.5)-12[2?(-2)2](4)65×3.08+3
计算(1)(+12)+(-7)-(+15)(2)16?23?(45?815)(3)-12×(1-0.5)-12[2?(-2)2](4)65×3.08+35×3.08....
计算(1)(+12)+(-7)-(+15)(2)16?23?(45?815)(3)-12×(1-0.5)-12[2?(-2)2](4)65×3.08+35×3.08.
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(1)(+12)+(-7)-(+15)
=12-7-15
=12-22
=-10;
(2)
?
?(
?
)
=
-
-
=
-
-
=-
;
(3)-12×(1-0.5)-
[2?(-2)2]
=-1×
-
×[2-4]
=-
+
×2
=-
+1
=
;
(4)65×3.08+35×3.08
=(65+35)×3.08
=100×3.08
=308.
=12-7-15
=12-22
=-10;
(2)
1 |
6 |
2 |
3 |
4 |
5 |
8 |
15 |
=
1 |
6 |
2 |
3 |
4 |
15 |
=
5 |
30 |
20 |
30 |
8 |
30 |
=-
23 |
30 |
(3)-12×(1-0.5)-
1 |
2 |
=-1×
1 |
2 |
1 |
2 |
=-
1 |
2 |
1 |
2 |
=-
1 |
2 |
=
1 |
2 |
(4)65×3.08+35×3.08
=(65+35)×3.08
=100×3.08
=308.
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