题目内容
(2009?泸西县模拟)直接写出得数.
25÷25%=
24
÷8=
+
÷3-
=
4÷
-
÷4=
×
÷
×
=
25÷25%=
24
| 16 |
| 17 |
| 1 |
| 8 |
| 1 |
| 3 |
| 1 |
| 8 |
4÷
| 1 |
| 5 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
分析:25÷25%,先把百分数化成小数,再计算;
24
÷8,先把除法变成乘法,24
分解成24+
再运用乘法分配律简算;
+
÷3-
先算除法,再运用加法交换律简算;
4÷
-
÷4同时运算除法,再计算减法;
×
÷
×
,先把除法变成乘法,再运用乘法结合律简算.
24
| 16 |
| 17 |
| 16 |
| 17 |
| 16 |
| 17 |
| 1 |
| 8 |
| 1 |
| 3 |
| 1 |
| 8 |
4÷
| 1 |
| 5 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
解答:解:25÷25%=100,
24
÷8=3
,
+
÷3-
=
,
4÷
-
÷4=19
,
×
÷
×
=
;
故答案为:100,3
,
,19
,
.
24
| 16 |
| 17 |
| 2 |
| 17 |
| 1 |
| 8 |
| 1 |
| 3 |
| 1 |
| 8 |
| 1 |
| 9 |
4÷
| 1 |
| 5 |
| 1 |
| 4 |
| 15 |
| 16 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 9 |
故答案为:100,3
| 2 |
| 17 |
| 1 |
| 9 |
| 15 |
| 16 |
| 1 |
| 9 |
点评:运算定律是常用的简便运算的方法,要熟练掌握,灵活运用.
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