题目内容
(2010?哈尔滨模拟)设[a]表示不大于数a的最大整数,如[1.9]=1,[2]=2.那么[1.36]+[1.36+
]+[1.36+
]+…+[1.36+
]+[1.36+
]=
1 |
30 |
2 |
30 |
28 |
30 |
29 |
30 |
40
40
.分析:根据高斯取整的特点,结合本题数字,因为
≈0.63,1.36+0.63=1.99<2,故应以此为分界点,分为两部分,即{[1.36]+[1.36+
]+[1.36+
]+…+[1.36+
]}以及{[1.36+
]+…+[1.36+
]},然后进行计算.
19 |
30 |
1 |
30 |
2 |
30 |
19 |
30 |
20 |
30 |
29 |
30 |
解答:解:[1.36]+[1.36+
]+[1.36+
]+…+[1.36+
]+[1.36+
],
={[1.36]+[1.36+
]+[1.36+
]+…+[1.36+
]}+{[1.36+
]+…+[1.36+
]}
=1×20+2×10,
=20+20,
=40.
故答案为:40.
1 |
30 |
2 |
30 |
28 |
30 |
29 |
30 |
={[1.36]+[1.36+
1 |
30 |
2 |
30 |
19 |
30 |
20 |
30 |
29 |
30 |
=1×20+2×10,
=20+20,
=40.
故答案为:40.
点评:对于高斯取整的问题,首先应认真分析,根据要求与题目中数字的特点,分部分进行解答.
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