2x²-5x+2=0
x²-5/2x+1=0
x²-2×5/4×x+(5/4)²-(5/4)²+1=0;
(x-5/4)²=25/16-1;
(x-5/4)²=9/16;
x-5/4=±3/4;
x=5/4±3/4;
x=2或x=-1/2;
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