题目内容
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分析:(1)(2)(3)题,直接约分计算;
(4)(6)运用乘法分配律简算;
(5)把86看作85+1,运用乘法分配律简算.
(4)(6)运用乘法分配律简算;
(5)把86看作85+1,运用乘法分配律简算.
解答:解:(1)
×
×
=
;
(2)
×
×17=5;
(3)
×
×
=
;
(4)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(5)
×86,
=
×(85+1),
=
×85+
,
=3+
,
=3
;
(6)(
+
)×54,
=
×54+
×54,
=42+10,
=52.
| 5 |
| 7 |
| 4 |
| 15 |
| 7 |
| 8 |
| 1 |
| 6 |
(2)
| 12 |
| 17 |
| 5 |
| 12 |
(3)
| 1 |
| 6 |
| 3 |
| 8 |
| 6 |
| 11 |
| 3 |
| 88 |
(4)
| 5 |
| 6 |
| 7 |
| 8 |
| 5 |
| 6 |
| 1 |
| 8 |
=
| 5 |
| 6 |
| 7 |
| 8 |
| 1 |
| 8 |
=
| 5 |
| 6 |
=
| 5 |
| 6 |
(5)
| 3 |
| 85 |
=
| 3 |
| 85 |
=
| 3 |
| 85 |
| 3 |
| 85 |
=3+
| 3 |
| 85 |
=3
| 3 |
| 85 |
(6)(
| 7 |
| 9 |
| 5 |
| 27 |
=
| 7 |
| 9 |
| 5 |
| 27 |
=42+10,
=52.
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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