方程x-5x+6=0怎么配平方
x^2-5x+6=0
(x^2-5x)+6=0
[x^2-5x+(5/2)^2]-(5/2)^2+6=0
(x-5/2)^2-25/4+6=0
(x-5/2)^2-1/4=0
(x-5/2)^2=1/4
x-5/2=1/2, x1=3
x-5/2=-1/2, x2=2
x=二分之三
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x^2-5x+6=0
(x^2-5x)+6=0
[x^2-5x+(5/2)^2]-(5/2)^2+6=0
(x-5/2)^2-25/4+6=0
(x-5/2)^2-1/4=0
(x-5/2)^2=1/4
x-5/2=1/2, x1=3
x-5/2=-1/2, x2=2
x=二分之三