题目内容
| 计算下面各题,怎样简便就怎样算. 97×
|
(
|
| ||||||||||||||
(
|
5÷[(
|
分析:(1)(2)(3)(4)运用乘法分配律计算,
(5)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序计算.
(5)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序计算.
解答:解:(1)97×
=96×
+1×
=5+
=5
;
(2)(
-
)÷
=
×
-
×
=
-
=
;
(3)
÷23+
×
=(
+
)×
=1×
=
;
(4)(
-
×
)÷
=(
-
)×
=
×
-
×
=
-
=
;
(5)5÷[(
+
)×
]
=5÷[
×
]
=5÷
=75.
| 5 |
| 96 |
=96×
| 5 |
| 96 |
| 5 |
| 96 |
=5+
| 5 |
| 96 |
=5
| 5 |
| 96 |
(2)(
| 5 |
| 27 |
| 5 |
| 36 |
| 5 |
| 9 |
=
| 5 |
| 27 |
| 9 |
| 5 |
| 5 |
| 36 |
| 9 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 12 |
(3)
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
=(
| 8 |
| 17 |
| 9 |
| 17 |
| 1 |
| 23 |
=1×
| 1 |
| 23 |
=
| 1 |
| 23 |
(4)(
| 5 |
| 9 |
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
=(
| 5 |
| 9 |
| 1 |
| 6 |
| 6 |
| 5 |
=
| 5 |
| 9 |
| 6 |
| 5 |
| 1 |
| 6 |
| 6 |
| 5 |
=
| 2 |
| 3 |
| 1 |
| 5 |
=
| 7 |
| 15 |
(5)5÷[(
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 13 |
=5÷[
| 13 |
| 15 |
| 1 |
| 13 |
=5÷
| 1 |
| 15 |
=75.
点评:(1)运用乘法分配律解决问题,(2)依据四则运算计算方法正确进行计算,是本题考查知识点.
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