题目内容
13
+86
×0.25+86
×0.625+86
×
.
| 4 |
| 19 |
| 15 |
| 19 |
| 15 |
| 19 |
| 15 |
| 19 |
| 1 |
| 8 |
分析:把后面的三个乘法算式利用利用乘法分配律简算,再进一步加上第一个数算出结果即可.
解答:解:13
+86
×0.25+86
×0.625+86
×
=13
+86
×(0.25+0.625+0.125)
=13
+86
×1
=13
+86
=100.
| 4 |
| 19 |
| 15 |
| 19 |
| 15 |
| 19 |
| 15 |
| 19 |
| 1 |
| 8 |
=13
| 4 |
| 19 |
| 15 |
| 19 |
=13
| 4 |
| 19 |
| 15 |
| 19 |
=13
| 4 |
| 19 |
| 15 |
| 19 |
=100.
点评:抓住数的特点,在算式中灵活选用运算定律简算.
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