初三数学(用配方法解方程)
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1、6X^2+X-12=0
X^2+1/6X-2=0
X^2+1/6X+1/144-2-1/144=0
X^2+1/6X+1/144=289/144
(X+1/12)^2=289/144
X+1/12=+_17/12
X=16/12 X=-18/12=-9/7
2, 2X^2+1-3X=0
X^2-3/2X+1/2=0
X^2-3/2X+9/16-9/16+1/2=0
X^2-3/2X+9/16=1/16
(X-3/4)^2=1/16
X-3/4=+_1/4
X=1 X= 1/2
X^2+1/6X-2=0
X^2+1/6X+1/144-2-1/144=0
X^2+1/6X+1/144=289/144
(X+1/12)^2=289/144
X+1/12=+_17/12
X=16/12 X=-18/12=-9/7
2, 2X^2+1-3X=0
X^2-3/2X+1/2=0
X^2-3/2X+9/16-9/16+1/2=0
X^2-3/2X+9/16=1/16
(X-3/4)^2=1/16
X-3/4=+_1/4
X=1 X= 1/2
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