题目内容
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分析:(1)(2)(3)(6)运用乘法分配律简算;
(4)运用乘法结合律简算;
(5)先算乘法,再算加法.
(4)运用乘法结合律简算;
(5)先算乘法,再算加法.
解答:解:(1)(
+
)×32,
=
×32+
×32,
=24+20,
=44;
(2)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)
×25+
,
=
×(25+1),
=
×26,
=14;
(4)
×
×16,
=
×(
×16),
=
×2,
=2
;
(5)
+
×
,
=
+
,
=
;
(6)(
+
)×12,
=
×12+
×12,
=4+6,
=10.
| 3 |
| 4 |
| 5 |
| 8 |
=
| 3 |
| 4 |
| 5 |
| 8 |
=24+20,
=44;
(2)
| 5 |
| 9 |
| 3 |
| 4 |
| 5 |
| 9 |
| 1 |
| 4 |
=
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
(3)
| 7 |
| 13 |
| 7 |
| 13 |
=
| 7 |
| 13 |
=
| 7 |
| 13 |
=14;
(4)
| 5 |
| 4 |
| 1 |
| 8 |
=
| 5 |
| 4 |
| 1 |
| 8 |
=
| 5 |
| 4 |
=2
| 1 |
| 2 |
(5)
| 1 |
| 5 |
| 2 |
| 9 |
| 3 |
| 10 |
=
| 1 |
| 5 |
| 1 |
| 15 |
=
| 4 |
| 15 |
(6)(
| 1 |
| 3 |
| 1 |
| 2 |
=
| 1 |
| 3 |
| 1 |
| 2 |
=4+6,
=10.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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