题目内容
计算(能简便要简便)
(
-
)×100
×
+
×
+
+
+
+
12×(
-
)×52
÷〔(
+
)×10〕2015
÷2015
×132×
(
+
)×23+
÷[(
-
)×
].
(
| 3 |
| 4 |
| 3 |
| 25 |
| 2 |
| 7 |
| 17 |
| 11 |
| 2 |
| 11 |
| 5 |
| 7 |
| 1 |
| 13 |
| 1 |
| 26 |
| 1 |
| 52 |
| 1 |
| 104 |
| 1 |
| 208 |
12×(
| 5 |
| 6 |
| 1 |
| 26 |
| 8 |
| 9 |
| 2 |
| 5 |
| 1 |
| 10 |
| 2015 |
| 2016 |
| 3 |
| 20 |
| 10 |
| 11 |
| 1 |
| 69 |
| 2 |
| 71 |
| 25 |
| 71 |
| 7 |
| 25 |
| 3 |
| 4 |
| 2 |
| 5 |
| 2 |
| 5 |
考点:整数、分数、小数、百分数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)(2)(4)(5)(6)(8)运用乘法分配律解答,
(3)化
=
-
,
=
-
,
=
-
,
=
-
,再运用加法结合律解答,
(7)运用乘法结合律解答.
(3)化
| 1 |
| 26 |
| 1 |
| 13 |
| 1 |
| 26 |
| 1 |
| 52 |
| 1 |
| 26 |
| 1 |
| 52 |
| 1 |
| 104 |
| 1 |
| 52 |
| 1 |
| 104 |
| 1 |
| 208 |
| 1 |
| 104 |
| 1 |
| 208 |
(7)运用乘法结合律解答.
解答:
解:(1)(
-
)×100
=
×100-
×100
=75-12
=63;
(2)
×
+
×
=
×(
+
)
=
×2
=
;
(3)
+
+
+
+
=
+
-
+
-
+
-
+
-
=
+
-
=
-
=
;
(4)12×(
-
)×52
=12×
×52-12×
×52
=520-24
=496;
(5)
÷[(
+
)×10]
=
÷[
×10+
×10]
=
÷[4+1]
=
÷5
=
;
(6)2015
÷2015
=2015×
+
×
=1+
=1
;
(7)
×132×
=
×(132×
)
=
×120
=18;
(8)(
+
)×23+
=
×23+
×23+
=
+(
+
)
=
+1
=1
(9)
÷[(
-
)×
]
=
÷[
×
]
=
÷
=2.
| 3 |
| 4 |
| 3 |
| 25 |
=
| 3 |
| 4 |
| 3 |
| 25 |
=75-12
=63;
(2)
| 2 |
| 7 |
| 17 |
| 11 |
| 2 |
| 11 |
| 5 |
| 7 |
=
| 2 |
| 7 |
| 17 |
| 11 |
| 5 |
| 11 |
=
| 2 |
| 7 |
=
| 4 |
| 7 |
(3)
| 1 |
| 13 |
| 1 |
| 26 |
| 1 |
| 52 |
| 1 |
| 104 |
| 1 |
| 208 |
=
| 1 |
| 13 |
| 1 |
| 13 |
| 1 |
| 26 |
| 1 |
| 26 |
| 1 |
| 52 |
| 1 |
| 52 |
| 1 |
| 104 |
| 1 |
| 104 |
| 1 |
| 208 |
=
| 1 |
| 13 |
| 1 |
| 13 |
| 1 |
| 208 |
=
| 2 |
| 13 |
| 1 |
| 208 |
=
| 403 |
| 2704 |
(4)12×(
| 5 |
| 6 |
| 1 |
| 26 |
=12×
| 5 |
| 6 |
| 1 |
| 26 |
=520-24
=496;
(5)
| 8 |
| 9 |
| 2 |
| 5 |
| 1 |
| 10 |
=
| 8 |
| 9 |
| 2 |
| 5 |
| 1 |
| 10 |
=
| 8 |
| 9 |
=
| 8 |
| 9 |
=
| 8 |
| 45 |
(6)2015
| 2015 |
| 2016 |
=2015×
| 1 |
| 2015 |
| 2015 |
| 2016 |
| 1 |
| 2015 |
=1+
| 1 |
| 2016 |
=1
| 1 |
| 2016 |
(7)
| 3 |
| 20 |
| 10 |
| 11 |
=
| 3 |
| 20 |
| 10 |
| 11 |
=
| 3 |
| 20 |
=18;
(8)(
| 1 |
| 69 |
| 2 |
| 71 |
| 25 |
| 71 |
=
| 1 |
| 69 |
| 2 |
| 71 |
| 25 |
| 71 |
=
| 1 |
| 3 |
| 46 |
| 71 |
| 25 |
| 71 |
=
| 1 |
| 3 |
=1
| 1 |
| 3 |
(9)
| 7 |
| 25 |
| 3 |
| 4 |
| 2 |
| 5 |
| 2 |
| 5 |
=
| 7 |
| 25 |
| 7 |
| 20 |
| 2 |
| 5 |
=
| 7 |
| 25 |
| 7 |
| 50 |
=2.
点评: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,是本题考查知识点.
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