题目内容
计算:
×
+1
后所得的结果末尾有
| ||
| 1999个9 |
| ||
| 1999个9 |
| ||
| 1999个9 |
3998
3998
个零.分析:先把最后一项拆成
+1
,然后运用乘法分配律计算即可.
| ||
| 1999个9 |
| ||
| 1999个0 |
解答:解:
×
+1
=
×
+
+1
=
×(
+1)+1
=
×1
+1
=1
×(
+1)
=1
×1
=1
;
故答案为:3998.
| ||
| 1999个9 |
| ||
| 1999个9 |
| ||
| 1999个9 |
=
| ||
| 1999个9 |
| ||
| 1999个9 |
| ||
| 1999个9 |
| ||
| 1999个0 |
=
| ||
| 1999个9 |
| ||
| 1999个9 |
| ||
| 1999个0 |
=
| ||
| 1999个9 |
| ||
| 1999个0 |
| ||
| 1999个0 |
=1
| ||
| 1999个0 |
| ||
| 1999个9 |
=1
| ||
| 1999个0 |
| ||
| 1999个0 |
=1
| ||
| 3998个0 |
故答案为:3998.
点评:完成此题,应认真观察,仔细分析,根据数字特点,运用运算定律灵活解答.
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