cubic both side: 1-y= 1-3y+3Y^1/2-y^3/2
cancel 1, one root would y^1/2=0, or y=0, x=1
when y!=0, y+2y^1/2-3=0, => y^1/2=-3, y=9, x=10
or => y^1/2=1, y=1, x=2
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厉害,这样算计算量还小
-怪哉-
♂
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04/24/2014 postreply
08:00:28