Solve by using identities 81p2-225q2
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81p^2 - 225q^2
= (9p)^2 - (15q)^2
= (9p + 15q)(9p - 15q) 【a^2-b^2 = (a+b)(a-b)】
= (9p)^2 - (15q)^2
= (9p + 15q)(9p - 15q) 【a^2-b^2 = (a+b)(a-b)】
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