Question

研

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所
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的
6

Answer 1

✨ 最佳解答 ✨

Ny-Ålesund

9^4 - 4^4
= (9^2)^2 - (4^2)^2
= (9^2 + 4^2)(9^2 - 4^2)
= (9^2 + 4^2)(9 + 4)(9 - 4)
= (9^2 + 4^2) × 13 × 5
= 97 × 13 × 5

7^4 - 6^4
= (7^2)^2 - (6^2)^2
= (7^2 + 6^2)(7^2 - 6^2)
= (7^2 + 6^2)(7 + 6)(7 - 6)
= (7^2 + 6^2) × 13 × 1
= 85 × 13 × 1

原式 = 97/17

研

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