题目内容
能简算的要简算.
| (
|
| ||||||||||||||||||
|
| 44-72×
|
考点:分数的简便计算
专题:运算定律及简算
分析:(1)(2)(3)运用乘法分配律解答,
(4)(5)按照从左到右顺序计算解答,
(6)按照先算乘法,再算减法顺序计算解答.
(4)(5)按照从左到右顺序计算解答,
(6)按照先算乘法,再算减法顺序计算解答.
解答:
解:(1)
÷9+
×
=
×(
+
)
=
×1
=
;
(2)(
+
)×32
=
×32+
×32
=24+20
=44;
(3)
×
+
×
=
×(
+
)
=
×1
=
;
(4)
×
×28
=
×28
=4
;
(5)
÷0.2×
=
×
=
;
(6)44-72×
=44-30
=14.
| 6 |
| 25 |
| 6 |
| 25 |
| 8 |
| 9 |
=
| 6 |
| 25 |
| 1 |
| 9 |
| 8 |
| 9 |
=
| 6 |
| 25 |
=
| 6 |
| 25 |
(2)(
| 3 |
| 4 |
| 5 |
| 8 |
=
| 3 |
| 4 |
| 5 |
| 8 |
=24+20
=44;
(3)
| 5 |
| 9 |
| 3 |
| 4 |
| 5 |
| 9 |
| 1 |
| 4 |
=
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
(4)
| 5 |
| 4 |
| 1 |
| 8 |
=
| 5 |
| 32 |
=4
| 3 |
| 8 |
(5)
| 3 |
| 20 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 2 |
(6)44-72×
| 5 |
| 12 |
=44-30
=14.
点评:(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,是本题考查知识点.
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