题目内容
计算题:
(1)-7+4
(2)(-2)×5
(3)(-
-
+
)÷
(4)|-
|÷
-
×(-3)2.
(1)-7+4
(2)(-2)×5
(3)(-
| 3 |
| 4 |
| 5 |
| 9 |
| 7 |
| 12 |
| 1 |
| 36 |
(4)|-
| 7 |
| 9 |
| 2 |
| 3 |
| 1 |
| 3 |
(1)-7+4=-(7-4)=-3; …(3分)
(2)(-2)×5=-10;…(3分)
(3)(-
-
+
)÷
=(-
-
+
)×36
=-
×36-
×36+
×36
=-27-20+21
=-26…(3分)
(4)|-
|÷
-
×(-3)2
=
×
-
×9…(2分)
=
-3
=-
.…(3分)
(2)(-2)×5=-10;…(3分)
(3)(-
| 3 |
| 4 |
| 5 |
| 9 |
| 7 |
| 12 |
| 1 |
| 36 |
=(-
| 3 |
| 4 |
| 5 |
| 9 |
| 7 |
| 12 |
=-
| 3 |
| 4 |
| 5 |
| 9 |
| 7 |
| 12 |
=-27-20+21
=-26…(3分)
(4)|-
| 7 |
| 9 |
| 2 |
| 3 |
| 1 |
| 3 |
=
| 7 |
| 9 |
| 3 |
| 2 |
| 1 |
| 3 |
=
| 7 |
| 6 |
=-
| 11 |
| 6 |
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