题目内容
用简便方法计算.
| 45×102 |
| ||||||||
| 25.28-11.65+34.72-38.35 | 36×(
|
(1)45×102
=45×(100+2),
=45×100+45×3,
=4500+90,
=4590.
(2)
+
+
+
=(
+
)+(
+
),
=1+
,
=1+2,
=3;
(3)25.28-11.65+34.72-38.35
=(25.28+34.72)-(11.65+38.35),
=60-50,
=10;
(4)36×(
+
-
)
=36×
+36×
-36×
,
=33+1
-13
,
=21.
=45×(100+2),
=45×100+45×3,
=4500+90,
=4590.
(2)
| 3 |
| 8 |
| 8 |
| 17 |
| 26 |
| 17 |
| 5 |
| 8 |
=(
| 3 |
| 8 |
| 5 |
| 8 |
| 8 |
| 17 |
| 26 |
| 17 |
=1+
| 34 |
| 17 |
=1+2,
=3;
(3)25.28-11.65+34.72-38.35
=(25.28+34.72)-(11.65+38.35),
=60-50,
=10;
(4)36×(
| 11 |
| 12 |
| 1 |
| 24 |
| 3 |
| 8 |
=36×
| 11 |
| 12 |
| 1 |
| 24 |
| 3 |
| 8 |
=33+1
| 1 |
| 2 |
| 1 |
| 2 |
=21.
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