题目内容
| 递等式计算(能简算的简算) 15÷
|
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|
6÷
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分析:(1)(2)(4)(5)(6)依据分数四则运算计算方法:先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答,(3)运用乘法分配律解答.
解答:解:(1)15÷
+
×8,
=27+1
,
=28
;
(2)
×
÷
,
=
÷
,
=1
;
(3)
÷23+
×
,
=(
+
)×
,
=1×
,
=
;
(4)6÷
-
÷6,
=20-0.05,
=19.95;
(5)
×0.375÷
,
=
÷
,
=
;
(6)
×
÷(
-
),
=
×
÷
,
=
÷
,
=
.
| 5 |
| 9 |
| 1 |
| 6 |
=27+1
| 1 |
| 3 |
=28
| 1 |
| 3 |
(2)
| 8 |
| 9 |
| 3 |
| 4 |
| 8 |
| 15 |
=
| 2 |
| 3 |
| 8 |
| 15 |
=1
| 1 |
| 4 |
(3)
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
=(
| 8 |
| 17 |
| 9 |
| 17 |
| 1 |
| 23 |
=1×
| 1 |
| 23 |
=
| 1 |
| 23 |
(4)6÷
| 3 |
| 10 |
| 3 |
| 10 |
=20-0.05,
=19.95;
(5)
| 2 |
| 9 |
| 6 |
| 7 |
=
| 1 |
| 12 |
| 6 |
| 7 |
=
| 7 |
| 72 |
(6)
| 1 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 12 |
=
| 1 |
| 3 |
| 3 |
| 4 |
| 1 |
| 3 |
=
| 1 |
| 4 |
| 1 |
| 3 |
=
| 3 |
| 4 |
点评:本题主要考查学生依据四则运算计算方法,以及运用乘法分配律解决问题的能力,注意运算的顺序及准确性.
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