题目内容
计算下列各式:
(1)(-13)+(-8)
(2)-27-(-17)
(3)(-
)×(-
)
(4)-1+(-2)-(-3)-5
(5)-24×(-
+
-
)
(6)|-2
|-(-2.5)+1-|1-2
|
(7)(-3)×
×(-
)×(-
)
(8)
+
+
+
(巧算)
(9)-7×(-
)+26×(-
)-2×
.
(1)(-13)+(-8)
(2)-27-(-17)
(3)(-
| 5 |
| 6 |
| 3 |
| 10 |
(4)-1+(-2)-(-3)-5
(5)-24×(-
| 1 |
| 2 |
| 3 |
| 4 |
| 1 |
| 3 |
(6)|-2
| 1 |
| 2 |
| 1 |
| 2 |
(7)(-3)×
| 5 |
| 6 |
| 4 |
| 5 |
| 1 |
| 4 |
(8)
| 1 |
| 6 |
| 1 |
| 20 |
| 1 |
| 12 |
| 1 |
| 30 |
(9)-7×(-
| 22 |
| 7 |
| 22 |
| 7 |
| 22 |
| 7 |
(1)(-13)+(-8)=-21;
(2)-27-(-17)=-10;
(3)(-
)×(-
)=
;
(4)-1+(-2)-(-3)-5
=-1-2+3-5
=-8+3
=-5;
(5)-24×(-
+
-
)
=24×
-24×
+24×
=12-18+8
=2;
(6)|-2
|-(-2.5)+1-|1-2
|
=2.5+2.5+1-1.5
=6-1.5
=4.5;
(7)(-3)×
×(-
)×(-
)
=-3×
×
×
=-
;
(8)
+
+
+
=
+
+
+
=
;
(9)-7×(-
)+26×(-
)-2×
=(7-26-2)×
=-21×
=-66.
(2)-27-(-17)=-10;
(3)(-
| 5 |
| 6 |
| 3 |
| 10 |
| 1 |
| 4 |
(4)-1+(-2)-(-3)-5
=-1-2+3-5
=-8+3
=-5;
(5)-24×(-
| 1 |
| 2 |
| 3 |
| 4 |
| 1 |
| 3 |
=24×
| 1 |
| 2 |
| 3 |
| 4 |
| 1 |
| 3 |
=12-18+8
=2;
(6)|-2
| 1 |
| 2 |
| 1 |
| 2 |
=2.5+2.5+1-1.5
=6-1.5
=4.5;
(7)(-3)×
| 5 |
| 6 |
| 4 |
| 5 |
| 1 |
| 4 |
=-3×
| 5 |
| 6 |
| 4 |
| 5 |
| 1 |
| 4 |
=-
| 1 |
| 2 |
(8)
| 1 |
| 6 |
| 1 |
| 20 |
| 1 |
| 12 |
| 1 |
| 30 |
=
| 10 |
| 60 |
| 3 |
| 60 |
| 5 |
| 60 |
| 2 |
| 60 |
=
| 1 |
| 3 |
(9)-7×(-
| 22 |
| 7 |
| 22 |
| 7 |
| 22 |
| 7 |
=(7-26-2)×
| 22 |
| 7 |
=-21×
| 22 |
| 7 |
=-66.
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