专业本科生可以选择自学哪些数学课程

：f(t) =t^3-5t^2+7t-3 f(1) = 1-5+7 -3 =0 t^3-5t^2+7t-3 = (t-1)(t^2 +at +3) coef. of t 3-a=7 a=-4 t^3-5t^2+7t-3 = (t-1)(t^2 -4t +3) = (t-1)(t-1)(t-3)

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