题目内容
直接写得数.
+0.625=
1÷0.05=
9.7+0.03=
×
=
78×9.9+7.8=
12-2
=
10÷10%=
1-
-
=
6
-
-4.25=
+
-
+
=
| 3 |
| 8 |
1÷0.05=
9.7+0.03=
| 4 |
| 5 |
| 5 |
| 28 |
78×9.9+7.8=
12-2
| 7 |
| 9 |
10÷10%=
1-
| 1 |
| 4 |
| 1 |
| 3 |
6
| 13 |
| 17 |
| 3 |
| 4 |
| 3 |
| 7 |
| 5 |
| 21 |
| 3 |
| 7 |
| 10 |
| 21 |
分析:根据小数和分数加减乘除的计算方法进行计算.
78×9.9+7.8根据乘法分配律进行计算;
6
-
-4.25根据连减的性质进行计算;
+
-
+
根据加法交换律和结合律进行计算.
78×9.9+7.8根据乘法分配律进行计算;
6
| 13 |
| 17 |
| 3 |
| 4 |
| 3 |
| 7 |
| 5 |
| 21 |
| 3 |
| 7 |
| 10 |
| 21 |
解答:解:
+0.625=1,
1÷0.05=20,
9.7+0.03=9.73,
×
=
,
78×9.9+7.8=780,
12-2
=9
,
10÷10%=100,
1-
-
=
,
6
-
-4.25=1
,
+
-
+
=
.
| 3 |
| 8 |
1÷0.05=20,
9.7+0.03=9.73,
| 4 |
| 5 |
| 5 |
| 28 |
| 1 |
| 7 |
78×9.9+7.8=780,
12-2
| 7 |
| 9 |
| 2 |
| 9 |
10÷10%=100,
1-
| 1 |
| 4 |
| 1 |
| 3 |
| 5 |
| 12 |
6
| 13 |
| 17 |
| 3 |
| 4 |
| 13 |
| 17 |
| 3 |
| 7 |
| 5 |
| 21 |
| 3 |
| 7 |
| 10 |
| 21 |
| 5 |
| 7 |
点评:口算时,注意运算符号和数据,然后再进一步计算.
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