题目内容
计算1949×(
-
)+47×(
-
)-1996×(
+
)+1003.
| 1 |
| 47 |
| 1 |
| 1996 |
| 1 |
| 1949 |
| 1 |
| 1996 |
| 1 |
| 1949 |
| 1 |
| 47 |
考点:分数的巧算
专题:计算问题(巧算速算)
分析:先运用乘法分配律,运用加法交换律结合律即连减的性质,再把同分母的分数结合,据此解答即可.
解答:
解:1949×(
-
)+47×(
-
)-1996×(
+
)+1003
=
-
+
-
-
-
+1003
=
-
+
-
-(
+
)+1003
=-1+(-1)-1+1003
=1000
| 1 |
| 47 |
| 1 |
| 1996 |
| 1 |
| 1949 |
| 1 |
| 1996 |
| 1 |
| 1949 |
| 1 |
| 47 |
=
| 1949 |
| 47 |
| 1949 |
| 1996 |
| 47 |
| 1949 |
| 47 |
| 1996 |
| 1996 |
| 1949 |
| 1996 |
| 47 |
=
| 1949 |
| 47 |
| 1996 |
| 47 |
| 47 |
| 1949 |
| 1996 |
| 1949 |
| 1949 |
| 1996 |
| 47 |
| 1996 |
=-1+(-1)-1+1003
=1000
点评:分析题干中的数据,运用运算律寻找简便方法.
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