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(2a-3b)(-2a-3b)+(-2a+b)^2 =-(2a-3b)(2a+3b)+(-2a+b)^2 =-(4a^2-9b^2)+4a^2-4ab+b^2 =-4a^2+9b^2+4a^2-4ab+b^2 =10b^2-4ab 非常に単純な二乗差式は
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