-3x^2+6x>2
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-3x^2+6x>2
-3x^2+6x>2
-3x^2+6x>2
x^2-2x<2/3
x^2-2x+1<5/3
(x-1)^2<5/3
开根号,x在±根号5/3+1之间
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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