國高中數學公式總整理. 乘法公式. 1. (a+b)(c+d) = ac+ad+bc+bd. 2. (a ± b)2 = a2 ± 2ab + b2. 3. (a+b)(a-b) = a2 - b2. 4. (a+b+c)2 = a2 + b2 + c2 + 2ab + 2bc + ...
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