题目内容
计算:
(1)(-1)2×23-(-4)÷2;(2)25×
-(-25)×
+25×(-
).
(1)(-1)2×23-(-4)÷2;(2)25×
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
(1)(-1)2×23-(-4)÷2
=1×8+4×
=8+2
=10;
(2)25×
-(-25)×
+25×(-
)
=25(
+
-
)
=25×1
=25.
=1×8+4×
| 1 |
| 2 |
=8+2
=10;
(2)25×
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
=25(
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
=25×1
=25.
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