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    A basketball player has observed that on average he scores only one out of every 10 attempts at a 3 point shot. If he attempts eight of these in the next game, find the probability that he will score at least once. 【查看更多】

     

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    A semipro baseball league has teams with 21 players each. League rules state that a player must be paid at least ＄15，000，and that the total of all players’ salaries for each team cannot exceed ＄700，000. What is the maximum possible salary，in dollars，for a single player？

    A. 270，000    B. 385，000    C. 400，000    D. 430，000    E.700，000

     

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    162、a=1是直线y=ax+1和直线y=（a-2）x-1垂直的
    充要
    条件．

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    1、集合A={-1，0，1}，B={-2，-1，0}，则A∪B=
    {-2，-1，0，1}
    ．

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    函数y=
    3x2
    -1（x≤0）的反函数是（　　）
    A、y=
    		(x+1)3
    （x≥-1）
    B、y=-
    		(x+1)3
    （x≥-1）
    C、y=
    		(x+1)3
    （x≥0）
    D、y=-
    		(x+1)3
    （x≥0）

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    已知函数f（x）=
    ax2+1bx+c
    （a、b、c∈Z）是奇函数，又f（1）=2，f（2）＜3，求a、b、c的值．

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