(1)(x+2)(x-1)=0
x=-2,x=1
(2)(x-2)(x-2)=2
x=2+根号下2,x=2-根号下2
(3)4xx-4x-3=0
(2x-3)(2x+1)=0
x=3/2,x=-1/2
(4)3xx-9x=2xx-2
xx-9x+81/4=-2+81/4
(x-9/2)(x-9/2)=73/4
x=9/2+根号下73/4, x=9/2-根号下73/4
这样可以么?
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