题目内容
| 能简算的要简算. 33×
| (
|
| ||||||||||||||
|
| 44-72×
|
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)(3)运用乘法分配律解答,
(4)按照从左到右顺序计算解答,
(5)(6)按照先算第二级运算,再算第一级运算顺序计算解答.
(4)按照从左到右顺序计算解答,
(5)(6)按照先算第二级运算,再算第一级运算顺序计算解答.
解答:
解:(1)33×
=32×
+1×
=18+
=18
;
(2)(
+
)×32
=
×32+
×32
=24+20
=44;
(3)
×
+
×
=
×(
+
)
=
×1
=
;
(4)
×
×16
=
×16
=2
;
(5)
+
×
=
+
=
;
(6)44-72×
=44-30
=14.
| 9 |
| 16 |
=32×
| 9 |
| 16 |
| 9 |
| 16 |
=18+
| 9 |
| 16 |
=18
| 9 |
| 16 |
(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 |
=2
| 1 |
| 2 |
(5)
| 1 |
| 5 |
| 2 |
| 9 |
| 3 |
| 10 |
=
| 1 |
| 5 |
| 1 |
| 15 |
=
| 4 |
| 15 |
(6)44-72×
| 5 |
| 12 |
=44-30
=14.
点评:本题主要考查学生依据四则运算计算方法正确进行计算,以及正确运用简便方法解决问题的能力.
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