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首先把等式中的所有x換成-x,即2f(-x)-f(x)=-x∧2-4x記為第二個式子 然後兩個式子相加f(x)+f(-x)=-2x∧2 然後在與第一個式子相加3f(x)=-3x∧2+4x 得f(x)=-x∧2+4x/3
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