题目内容
用简便方法计算(要求写出主要简算过程).
| 15.6÷
|
(1)
+
+
+
,
=(
+
)+(
+
),
=1+
,
=1
;
(2)15.6÷
+4
×2.25,
=15.6×
+4.4×2.25,
=15.6×2.25+4.4×2.25,
=(15.6+4.4)×2.25,
=20×2.25,
=45.
| 1 |
| 6 |
| 2 |
| 9 |
| 5 |
| 6 |
| 5 |
| 9 |
=(
| 1 |
| 6 |
| 5 |
| 6 |
| 5 |
| 9 |
| 2 |
| 9 |
=1+
| 7 |
| 9 |
=1
| 7 |
| 9 |
(2)15.6÷
| 4 |
| 9 |
| 2 |
| 5 |
=15.6×
| 9 |
| 4 |
=15.6×2.25+4.4×2.25,
=(15.6+4.4)×2.25,
=20×2.25,
=45.
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