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haha_eunice 寫道: assume A = 3 and B = 2.
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TingTing 寫道: you Assume A + B = C, and assume A = 3 and B = 2. & you factoring out (A+B-C) should be equal to zero. as (A+B-(A+B)) = (A-A+B-B) =0 therefore , A(0) = - B(0) i.e. 0=0 :-P
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