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(2-x)平方=16 2-x=±4 x=2±4 x1=6,x2=-2 4(x+1)平方-25=0 (x-1)^2=25/4 x-1=±5/2 x=1±5/2 x1=7/2 x2=-3/2 x平方-2x+1=3 (x-1)^2=3 x-1=±√3 x1=1+√3 x2=1-√3
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