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x²;-4x+4+1=0 (x-2)²;=-1 x-2=±i x=2-i,x=2+i
去括弧2x-4=4x-80 移項2x-4x=-80+4 合併同類項-2x=-76 係數化為1 x=38 完畢,請責備指正.
0.2x=20 x=100
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