操作——这两个操作的结果是否相似?
Operations - Are the results of these two operations similar to each other?
给定两组数字,即
[3, 4, 5]
和 [7, 8, 9]
。
(3/7 + 4/8 + 5/9)
和 3 * (3 + 4 + 5) / (7 + 8 + 9)
的结果是否相似?这有任何定理吗?
让我们把反转的问题:
Can difference between a / d + b / e + c / f
and 3 * (a + b + c) /
(d + e + f)
be arbitrary large?
答案是肯定:
让a = c = d = e = 1
和b = f
是一个大数。我们有:
a / d + b / e + c / f = 1 / 1 + b / 1 + 1 / b ~ b + 1
3 * (1 + b + 1) / (1 + 1 + b) = 3
区别是
b + 1 - 3 = b - 2
当f = b
任意大时,差值(b - 2
)也是任意大。
这就是为什么 原始问题 的答案是
there's no guarantee that the results will be similar, i.e. close
enough
给定两组数字,即
[3, 4, 5]
和 [7, 8, 9]
。
(3/7 + 4/8 + 5/9)
和 3 * (3 + 4 + 5) / (7 + 8 + 9)
的结果是否相似?这有任何定理吗?
让我们把反转的问题:
Can difference between
a / d + b / e + c / f
and3 * (a + b + c) / (d + e + f)
be arbitrary large?
答案是肯定:
让a = c = d = e = 1
和b = f
是一个大数。我们有:
a / d + b / e + c / f = 1 / 1 + b / 1 + 1 / b ~ b + 1
3 * (1 + b + 1) / (1 + 1 + b) = 3
区别是
b + 1 - 3 = b - 2
当f = b
任意大时,差值(b - 2
)也是任意大。
这就是为什么 原始问题 的答案是
there's no guarantee that the results will be similar, i.e. close enough