✨ 最佳解答 ✨
360 * 361 = 18 * 20 * 19 * 19
x^2 +38x -129960 = 0
1 ___ - 18 * 19
1 ___ 20 * 19
(x -18*19)(x +20*19) = 0
x = 18*19 or -20*19 又 a > b => a = 18*19, b = -20*19
a - b = 18*19 - (-20*19) = 38*19 = 722
✨ 最佳解答 ✨
360 * 361 = 18 * 20 * 19 * 19
x^2 +38x -129960 = 0
1 ___ - 18 * 19
1 ___ 20 * 19
(x -18*19)(x +20*19) = 0
x = 18*19 or -20*19 又 a > b => a = 18*19, b = -20*19
a - b = 18*19 - (-20*19) = 38*19 = 722
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