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國二數學 弄不清頭緒
Sep 18th 2014, 14:31

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(X+7)(X-5)*(X+3)(X-1) =(X^2+2X-35)(X^2+2X-3) =((X^2+2X-5)-30)((X^2+2X-5)+2) =(0-30)(0+2) =-30*2 =-60...
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