ï¼2ï¼
2x²-7x+6=0
x²-7/2x=-3
(x-7/4)²=-3+49/16=1/16
x-7/4=±1/4
x1=7/4-1/4=3/2
x2=7/4+1/4=2
ï¼3ï¼
3x²-6x-2=0
x²-2x=1/3
(x-1)²=1/3+1=4/3
x-1=±2â3/3
x1=(3-2â3)/3
x2=(3+2â3)/3
ï¼4ï¼
x²+7x-3=4x-4
x²-3x=-1
(x-3/2)²=-1+9/4=5/4
(x-3/2)=屉5/2
x1=(3-â5)/2
x2=(3+â5)/2
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