2X方减X等于一怎么解?
2x^2-x = 12x^2-x-1 = 0
(2x+1)(x-1) = 0
两个数的乘积等于0的话，只需要其中一个数的等于0就是了。
2x+1 = 0 或 x-1 = 0
解得：x= -1/2 或 x =1
解：2x^2-x-1=0，
(2x+1)(x-1)=0，
2x+1=0或x-1=0，
解得x=-1/2或x=1
2x^2-x=1
2x^2-x-1=0
(2x+1)(x-1)=0
x=-1/2 or 1
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