题目内容
简便计算:
(1)-9
×81
(2)-52×
-(-25)×
-(-5)2÷8.
(1)-9
| 8 |
| 9 |
(2)-52×
| 3 |
| 2 |
| 5 |
| 8 |
(1)原式=(
-10)×81
=
×81-10×81
=9-810
=-801;
(2)原式=-25×
+25×
-25÷8
=-
+
-
=-25,
| 1 |
| 9 |
=
| 1 |
| 9 |
=9-810
=-801;
(2)原式=-25×
| 3 |
| 2 |
| 5 |
| 8 |
=-
| 75 |
| 2 |
| 125 |
| 8 |
| 25 |
| 8 |
=-25,
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