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18(a+b)の平方c-2(a-b)の平方c =2c[9(a+b)²-(a-b)²] =2c[(3a+3b)²-(a-b)²] =2c(3a+3b+a-b)(3a+3b-a+b) =2c(4a+2b)(2a+4b) =8c(2a+b)(a+2b)
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