题目内容
能简便的要用简便方法计算.
2.5×3.6
(0.25+0.125)×8
29
-
+
-
.
2.5×3.6
(0.25+0.125)×8
29
| 4 |
| 5 |
| 7 |
| 8 |
| 1 |
| 5 |
| 1 |
| 8 |
(1)2.5×3.6
=2.5×4×0.9
=10×0.9
=9;
(2)(0.25+0.125)×8
=0.25×8+0.125×8
=2+1
=3;
(3)29
-
+
-
=(29
+
)-(
+
)
=30-1
=29.
=2.5×4×0.9
=10×0.9
=9;
(2)(0.25+0.125)×8
=0.25×8+0.125×8
=2+1
=3;
(3)29
| 4 |
| 5 |
| 7 |
| 8 |
| 1 |
| 5 |
| 1 |
| 8 |
=(29
| 4 |
| 5 |
| 1 |
| 5 |
| 7 |
| 8 |
| 1 |
| 8 |
=30-1
=29.
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