x²-2x=5
x²-2x+1=5+1
(x-1)²=6
x-1=屉6
x1=1+â6 x2=1-â6
ï¼x+1ï¼ï¼x-1ï¼+2ï¼x+3ï¼=8
x²-1+2x+6=8
x²+2x-3=0
(x+3)(x-1)=0
x1=-3 x2=1
1/2x²-x-3/2=0
x²-2x-3=0
(x+1)(x-3)=0
x1=-1 x2=3
x²-x-1=0
x²-x+(1/2)²=1+1/4
(x-1/2)²=5/4
x-1/2=屉5/2
x1=(1+â5)/2 x2=(1-â5)/2
x²-ï¼2åæ ¹å·3+1ï¼x+2åæ ¹å·3=0
(x-1)(x-2â3)=0
x1=1 x2=2â3
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