题目内容
| 计算下面各题,能简算的要用简便方法算. 32×(
|
|
| ||||||||||||||||||||||
|
|
[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)运用乘法分配律解答,
(3)(5)(6)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即可解答,
(4)运用加法交换律即可解答.
(3)(5)(6)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即可解答,
(4)运用加法交换律即可解答.
解答:
解:(1)32×(
+4)
=32×
+32×4
=24+128
=152;
(2)
×24-
÷
=24×(
-
)
=24×
=4.8;
(3)
×[(
-
)÷
]
=
×[
÷
]
=
×
=
;
(4)
×
+
+
=
+
+
=1+
=1
;
(5)
÷[(
-
)×
]
=
÷[
×
]
=
÷
=8
;
(6)[1-(
+
)]÷
=[1-
]÷
=
÷
=1.5.
| 3 |
| 4 |
=32×
| 3 |
| 4 |
=24+128
=152;
(2)
| 3 |
| 5 |
| 2 |
| 5 |
| 1 |
| 24 |
=24×(
| 3 |
| 5 |
| 2 |
| 5 |
=24×
| 1 |
| 5 |
=4.8;
(3)
| 3 |
| 4 |
| 7 |
| 15 |
| 1 |
| 5 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 4 |
| 15 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 2 |
| 5 |
=
| 3 |
| 10 |
(4)
| 4 |
| 5 |
| 5 |
| 18 |
| 3 |
| 7 |
| 7 |
| 9 |
=
| 2 |
| 9 |
| 7 |
| 9 |
| 3 |
| 7 |
=1+
| 3 |
| 7 |
=1
| 3 |
| 7 |
(5)
| 7 |
| 8 |
| 7 |
| 8 |
| 3 |
| 4 |
| 4 |
| 5 |
=
| 7 |
| 8 |
| 1 |
| 8 |
| 4 |
| 5 |
=
| 7 |
| 8 |
| 1 |
| 10 |
=8
| 3 |
| 4 |
(6)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 5 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 8 |
| 1 |
| 4 |
=1.5.
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)运用简便方法解决问题.
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