题目内容
看谁算得快.
1-
-
-
+
0.75+
+
+0.25+0.625.
1-
| 1 |
| 2 |
| 3 |
| 8 |
| 7 |
| 8 |
| 5 |
| 12 |
| 1 |
| 6 |
0.75+
| 1 |
| 12 |
| 1 |
| 14 |
| 1 |
| 8 |
分析:(1)按照从左向右的顺序进行计算;
(2)按照从左向右的顺序进行计算;
(3)按照从左向右的顺序进行计算;
(4)根据加法交换律进行计算.
(2)按照从左向右的顺序进行计算;
(3)按照从左向右的顺序进行计算;
(4)根据加法交换律进行计算.
解答:解:
(1)1-
-
,
=
-
,
=
;
(2)
-
+
,
=
+
,
=
;
(3)0.75+
+
,
=
+
,
=
;
(4)
+0.25+0.625,
=
+0.625+0.25,
=0.75+0.25,
=1.
(1)1-
| 1 |
| 2 |
| 3 |
| 8 |
=
| 1 |
| 2 |
| 3 |
| 8 |
=
| 1 |
| 8 |
(2)
| 7 |
| 8 |
| 5 |
| 12 |
| 1 |
| 6 |
=
| 11 |
| 24 |
| 1 |
| 6 |
=
| 5 |
| 8 |
(3)0.75+
| 1 |
| 12 |
| 1 |
| 14 |
=
| 5 |
| 6 |
| 1 |
| 14 |
=
| 19 |
| 21 |
(4)
| 1 |
| 8 |
=
| 1 |
| 8 |
=0.75+0.25,
=1.
点评:考查了分数和小数加减法的混合运算,一般按照从左向右的顺序进行计算,能简算的要简算.
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