the keys are in the bag 为什么用are

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• 已知数列｛an}的通项公式为an=(n+2)*(9/10)^n,试问n取何值时,an取最大值?试求出最大值.为什么用an/a（n-1）,算的是当n=7时有最大值;而用a（n+1）/an,算的是当n=8时有最大值.算的方法如下：（是不是方法错啦?）an=(n+2)*(9/10)^n a(n+1)=(n+3)*(9/10)^(n+1) a(n+1)/an=[(n+3)*(9/10)^(n+1)]/[(n+2)*(9/10)^n] =9(n+3)/[10(n+2)] 当a(n+1)/an≥1时,说明an是递增数列 即9(n+3)/[10(n+2)]≥1 解得n≤7,即an在n≤7时是递增的,在n>7时是递减的 所以an在n=7时an最大a7=9*(9/10)^7=9^8/10^7
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• 1.You are my first good friend here.这里为什么用my而不用my the?2.My father can wear it for playing basketball.为什么用playing?3.many和much和lot of的区别.4.Let Kate come to Huaxing Clothes Store soon.为什么是come to 5.Mary needs a bag for school.为什么用for不用to?6.I'll take that pair of shoes.为什么用take不用want和need?7.这件绿色的T恤this green T-shirt为什么用this不用the?8.one和ones的用法.9.bring的对应词。
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