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幼苗
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s=3[1+2+3+…+(33-x)]+3(1+2+…+y)+[1+2+…+(x-y-2)],
=$frac{3×(33-x)(34-x)}{2}$+$frac{3y(y+1)}{2}$+$frac{(x-y-2)(x-y-1)}{2}$,
=2x2-(y+102)x+2y2+3y+1684,
=2(x-$frac{y+102}{4}$)2+$frac{1}{8}$(15y2-180y+3068),
=2(x-$frac{y+102}{4}$)2+$frac{15}{8}$(y-6)2+316≥316.
又当x=27,y=6时,s=316,
故当电梯停在第27层时,不满意的总分最小,最小值为316.
1年前
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