题目内容
用你喜欢的方法计算
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分析:(1)运用乘法分配律简算;
(2)约分计算;
(3)把除法转化为乘法,运用乘法分配律简算;
(4)先去括号,然后约分计算;
(5)先算括号内的,再算括号外的;
(6)把括号内的算式改写成乘法算式,约分计算,然后相加即可.
(2)约分计算;
(3)把除法转化为乘法,运用乘法分配律简算;
(4)先去括号,然后约分计算;
(5)先算括号内的,再算括号外的;
(6)把括号内的算式改写成乘法算式,约分计算,然后相加即可.
解答:解:(1)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(2)
×64×
,
=40×
,
=30;
(3)(
-
)÷
,
=(
-
)×
,
=
×
-
×
,
=
-
,
=
;
(4)
×(26×
),
=
×26×
,
=6;
(5)
÷(
+
),
=
÷
,
=
×
,
=
;
(6)
÷
÷
,
=
×4×
,
=3;
(7)(
+
+…+
)+(
+
+…+
),
=
×100+
×100,
=30+40,
=70.
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 6 |
| 3 |
| 4 |
=
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
(2)
| 5 |
| 8 |
| 3 |
| 4 |
=40×
| 3 |
| 4 |
=30;
(3)(
| 5 |
| 18 |
| 5 |
| 24 |
| 5 |
| 6 |
=(
| 5 |
| 18 |
| 5 |
| 24 |
| 6 |
| 5 |
=
| 5 |
| 18 |
| 6 |
| 5 |
| 5 |
| 24 |
| 6 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 12 |
(4)
| 40 |
| 13 |
| 3 |
| 40 |
=
| 40 |
| 13 |
| 3 |
| 40 |
=6;
(5)
| 3 |
| 8 |
| 1 |
| 2 |
| 1 |
| 4 |
=
| 3 |
| 8 |
| 3 |
| 4 |
=
| 3 |
| 8 |
| 4 |
| 3 |
=
| 1 |
| 2 |
(6)
| 9 |
| 22 |
| 1 |
| 4 |
| 6 |
| 11 |
=
| 9 |
| 22 |
| 11 |
| 6 |
=3;
(7)(
| 3 |
| 10 |
| 3 |
| 10 |
| 3 |
| 10 |
| 2 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
=
| 3 |
| 10 |
| 2 |
| 5 |
=30+40,
=70.
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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