题目内容
67×
+2
×3.75-4
×25%=
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| 4 |
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| 2 |
25
25
.分析:把百分数化为分数,原式变为67×
+2
×3
-4
×
,运用加法交换律与结合律以及乘法分配律计算67×
和4
×
,进一步解决问题.
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解答:解:67×
+2
×3.75-4
×25%
=67×
+2
×3
-4
×
=(67-4
)×
+
×
=
×
+
=
+
=25
故答案为:25.
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| 4 |
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| 2 |
=67×
| 1 |
| 4 |
| 1 |
| 2 |
| 3 |
| 4 |
| 1 |
| 2 |
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| 4 |
=(67-4
| 1 |
| 2 |
| 1 |
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| 15 |
| 4 |
=
| 125 |
| 2 |
| 1 |
| 4 |
| 75 |
| 8 |
=
| 125 |
| 8 |
| 75 |
| 8 |
=25
故答案为:25.
点评:仔细注意观察题目中数字构成的特点和规律,运用运算定律或运算技巧,进行简便计算.
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