Re: [中學] 數學競試題
※ 引述《k32314282 (我只是打工的)》之銘言:
: 已知三次多項式f(x)滿足以下條件:
: 1≦f(-1)≦2,1≦f(1)≦3,2≦f(2)≦4,-1≦f(3)≦1
: 若f(4)的範圍為[a,b],試求a+b之值。
: 請問這該如何下手...
: 感謝
f(4)=f(-1)*6/(-24)+f(1)*10/4+f(2)*15/(-3)+f(3)*30/8
so a+b=3*6/(-24)+4*10/4+6*15/(-3)+0*30/8=-83/4
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