题目内容
(2011?于都县)先填空,再列出综合算式.
(1)8
(2)0.75
综合算式:
(1)8
÷
| ||
12
12
| -4 |
8
8
综合算式:8÷
-4;
| 2 |
| 3 |
8÷
-4;
| 2 |
| 3 |
(2)0.75
-
| ||
| 9 |
| 16 |
| 9 |
| 16 |
×
| ||
| 1 |
| 4 |
| 1 |
| 4 |
(0.75-
)×
| 3 |
| 16 |
| 4 |
| 9 |
(0.75-
)×
.| 3 |
| 16 |
| 4 |
| 9 |
分析:根据运算法则逐步计算,然后根据运算顺序列出综合算式.
解答:解:(1)8÷
=12;
12-4=8;
综合算式是:8÷
-4;
(2)0.75-
=
-
=
;
×
=
;
综合算式是:(0.75-
)×
.
故答案为:12,8,8÷
-4;
,
,(0.75-
)×
.
| 2 |
| 3 |
12-4=8;
综合算式是:8÷
| 2 |
| 3 |
(2)0.75-
| 3 |
| 16 |
| 3 |
| 4 |
| 3 |
| 16 |
| 9 |
| 16 |
| 9 |
| 16 |
| 4 |
| 9 |
| 1 |
| 4 |
综合算式是:(0.75-
| 3 |
| 16 |
| 4 |
| 9 |
故答案为:12,8,8÷
| 2 |
| 3 |
| 9 |
| 16 |
| 1 |
| 4 |
| 3 |
| 16 |
| 4 |
| 9 |
点评:在写综合算式时,要分清楚是先算的什么,后算的是什么;如果先算加减,后算乘除时要利用小括号来改变运算顺序.
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