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由題意: a+b=0 cd=1 x=5或者-5 當x=5時, x+5a+5b-cd =x+5(a+b)-cd =5+5×0-1 =4 當x=5時, x+5a+5b-cd =x+5(a+b)-cd =-5+5×0-1 =-6
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