题目内容
计算:
(1)(-81)÷2
-
÷(-2)4
(2)-14+25×
-(-25)×
+25×(-
)
(1)(-81)÷2
| 1 |
| 4 |
| 4 |
| 9 |
(2)-14+25×
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
(1)原式=-81×
-
×
=-36-
=-36
;
(2)原式=-1+25×
+25×
-25×
=-1+25×(
+
-
)
=-1+25
=24.
| 4 |
| 9 |
| 4 |
| 9 |
| 1 |
| 16 |
=-36-
| 1 |
| 36 |
=-36
| 1 |
| 36 |
(2)原式=-1+25×
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
=-1+25×(
| 3 |
| 4 |
| 2 |
| 4 |
| 1 |
| 4 |
=-1+25
=24.
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