| d - b = 757 |
| 送交者: 零加一中 2019月11月28日07:28:32 於 [靈機一動] 發送悄悄話 |
| 回 答: 趣味的數學-192 由 gugeren 於 2019-11-27 22:39:07 |
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a = m^4 c = n^2 19 = c - a = (n + m^2)(n - m^2) Since 19 is prime, n + m^2 = 19 and n - m^2 = 1. n = 10 and m = 3 c = 100 and a = 81 d = 1000 and b = 243 d - b = 757 |
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