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對y=x^4-8x^3+18x^2-1求導 設導數等於零 就可求出極值點的橫坐標x 然後代人方程得到極值y的值. y的導數=4x^3-24x^2+36x=4x(x^2-6x+9)=4x(x-3)^2=0 得x=0或x=3 當x=0時,y=-1 當x=3時,y=26 所以極值為-1和26.
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