题目内容
递等式计算,能简便的用简便方法.
|
| 4
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| (
| 1
|
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)(2)(5)按照从左到右顺序计算,
(3)运用乘法分配律解答,
(4)运用乘法交换律解答,
(6)按照先算乘法,再算加法的顺序计算.
(3)运用乘法分配律解答,
(4)运用乘法交换律解答,
(6)按照先算乘法,再算加法的顺序计算.
解答:
解:(1)
÷
×
=
×
=
;
(2)
×
×
=
×
=
;
(3)4
×
-3
×0.375
=(4
-3
)×0.375
=1×0.375
=0.375;
(4)
÷7×6×17
=
×17÷7×6
=4÷7×6
=3
;
(5)(
+
-
)×48
=
×48+
×48-
×48
=42+8-32
=18;
(6)1
+
×
=1
+
=1
.
| 5 |
| 6 |
| 5 |
| 34 |
| 2 |
| 13 |
=
| 17 |
| 3 |
| 2 |
| 13 |
=
| 34 |
| 39 |
(2)
| 4 |
| 5 |
| 9 |
| 20 |
| 5 |
| 3 |
=
| 9 |
| 25 |
| 5 |
| 3 |
=
| 3 |
| 5 |
(3)4
| 2 |
| 11 |
| 3 |
| 8 |
| 2 |
| 11 |
=(4
| 2 |
| 11 |
| 2 |
| 11 |
=1×0.375
=0.375;
(4)
| 4 |
| 17 |
=
| 4 |
| 17 |
=4÷7×6
=3
| 3 |
| 7 |
(5)(
| 7 |
| 8 |
| 1 |
| 6 |
| 2 |
| 3 |
=
| 7 |
| 8 |
| 1 |
| 6 |
| 2 |
| 3 |
=42+8-32
=18;
(6)1
| 7 |
| 19 |
| 5 |
| 6 |
| 8 |
| 19 |
=1
| 7 |
| 19 |
| 20 |
| 57 |
=1
| 779 |
| 1083 |
点评:本题考查知识点:(1)依据四则运算计算方法正确进行计算,(2)正确运用简便方法解决问题.
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