题目内容
| 用简便方法计算. 17×
| (
| ||||||||||||
|
|
(1)17×
=(16+1)×
=16×
+1×
=9+
=9
;
(2)(
+
)×32
=
×32+
×32
=24+20
=44;
(3)
×
+
×
=
×(
+
)
=
×1
=
;
(4)
×
×16
=
×(
×16)
=
×2
=
.
| 9 |
| 16 |
=(16+1)×
| 9 |
| 16 |
=16×
| 9 |
| 16 |
| 9 |
| 16 |
=9+
| 9 |
| 16 |
=9
| 9 |
| 16 |
(2)(
| 3 |
| 4 |
| 5 |
| 8 |
=
| 3 |
| 4 |
| 5 |
| 8 |
=24+20
=44;
(3)
| 5 |
| 9 |
| 3 |
| 4 |
| 5 |
| 9 |
| 1 |
| 4 |
=
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
(4)
| 5 |
| 4 |
| 1 |
| 8 |
=
| 5 |
| 4 |
| 1 |
| 8 |
=
| 5 |
| 4 |
=
| 5 |
| 2 |
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