解下列各题,1.2(x-3)²=x(x-3) 2.(x-1)²-5(x-1)+6=0 3.1/2(2t-8)×4/5t=12.61.2(x-3)²=x(x-3)2.(x-1)²-5(x-1)+6=03.1/2(2t-8)×4/5t=12.6

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