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由已知得2x^2-4x=54 即x^2-2x-27=0 由求根公式得到x1=1+2sqrt(7),x2=1-2sqrt(7). (2)1/2*x-11=29+1/2*x這個好像有問題 (3)72-(3-x)=123 即69+x=123 即x=54
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