题目内容
下面各题怎样算简便就怎样算,每题都要写出主要的计算过程.
12×
+12÷
+
÷
+
(
-
×9)÷
97×
(
+
)÷(1-
)
×
÷
.
12×
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 7 |
| 5 |
| 7 |
| 5 |
| 6 |
| 5 |
| 12 |
| 3 |
| 4 |
| 1 |
| 15 |
| 3 |
| 5 |
97×
| 5 |
| 96 |
| 3 |
| 5 |
| 3 |
| 10 |
| 1 |
| 10 |
| 5 |
| 8 |
| 4 |
| 7 |
| 5 |
| 7 |
分析:本题要在运用四则混合运算法则的基础上,认真分析式中数据,找到合适的简算方法:算式一、三、四、五可据分配律可据分配律进行简算;算式二六据运算法则计算即可.
解答:解:(1)12×
+12÷
=4+18,
=22;
(2)
+
÷
+
=
+
+
,
=1
;
(3)(
-
×9)÷
=(
-
)×
,
=
×
-
×
,
=
-1,
=
;
(4)97×
=96×
+
,
=5+
,
=5
;
(5)(
+
)÷(1-
)
=(
+
)×
,
=
×
+
×
,
=
+
,
=1;
(6)
×
÷
=
×
×
,
=
.
| 1 |
| 3 |
| 2 |
| 3 |
=4+18,
=22;
(2)
| 1 |
| 7 |
| 5 |
| 7 |
| 5 |
| 6 |
| 5 |
| 12 |
=
| 1 |
| 7 |
| 6 |
| 7 |
| 5 |
| 12 |
=1
| 5 |
| 12 |
(3)(
| 3 |
| 4 |
| 1 |
| 15 |
| 3 |
| 5 |
=(
| 3 |
| 4 |
| 3 |
| 5 |
| 5 |
| 3 |
=
| 3 |
| 4 |
| 5 |
| 3 |
| 3 |
| 5 |
| 5 |
| 3 |
=
| 5 |
| 4 |
=
| 1 |
| 4 |
(4)97×
| 5 |
| 96 |
=96×
| 5 |
| 96 |
| 5 |
| 96 |
=5+
| 5 |
| 96 |
=5
| 5 |
| 96 |
(5)(
| 3 |
| 5 |
| 3 |
| 10 |
| 1 |
| 10 |
=(
| 3 |
| 5 |
| 3 |
| 10 |
| 10 |
| 9 |
=
| 3 |
| 5 |
| 10 |
| 9 |
| 3 |
| 10 |
| 10 |
| 9 |
=
| 2 |
| 3 |
| 1 |
| 3 |
=1;
(6)
| 5 |
| 8 |
| 4 |
| 7 |
| 5 |
| 7 |
=
| 5 |
| 8 |
| 4 |
| 7 |
| 7 |
| 5 |
=
| 1 |
| 2 |
点评:在计算有关于分数的题目时要注意将结果化为最简分数.
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