题目内容
简算与巧算:23
×
十
÷
+4÷
.
| 12 |
| 13 |
| 4 |
| 7 |
| 1 |
| 3 |
| 7 |
| 4 |
| 7 |
| 4 |
考点:分数的简便计算
专题:运算定律及简算
分析:根据除以一个不为0的数等于乘这个数的倒数,把23
×
十
÷
+4÷
改写成23
×
十
×
+4×
,进而运用乘法分配律简算.
| 12 |
| 13 |
| 4 |
| 7 |
| 1 |
| 3 |
| 7 |
| 4 |
| 7 |
| 4 |
| 12 |
| 13 |
| 4 |
| 7 |
| 1 |
| 3 |
| 4 |
| 7 |
| 4 |
| 7 |
解答:
解:23
×
十
÷
+4÷
=23
×
十
×
+4×
=(23
十
+4)×
=
×
=
.
| 12 |
| 13 |
| 4 |
| 7 |
| 1 |
| 3 |
| 7 |
| 4 |
| 7 |
| 4 |
=23
| 12 |
| 13 |
| 4 |
| 7 |
| 1 |
| 3 |
| 4 |
| 7 |
| 4 |
| 7 |
=(23
| 12 |
| 13 |
| 1 |
| 3 |
| 4 |
| 7 |
=
| 1102 |
| 39 |
| 4 |
| 7 |
=
| 4408 |
| 273 |
点评:此题考查分数的简便计算,关键是把原来的算式创造出能用简便方法计算的形式,再进一步求得结果.
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