完全不能用,别浪费时间了!
there is a little bit deviation. When I input equation -x^3+8x^2-13x+6=0, it turned out to be three 3 solutions, two of whom are with plural, but in fact when factoring the equation to be (x-6)(1-x)^2=0, the each of its solution do not contain plural. That's strange.
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