• 2022-07-01 问题

    不等式 |x-2| A: {x|x B: {x|x>5} C: {x|-1 D: {x|x5}

    不等式 |x-2| A: {x|x B: {x|x>5} C: {x|-1 D: {x|x5}

  • 2022-05-31 问题

    设函数y=x5,则y(5)|x=0=______.

    设函数y=x5,则y(5)|x=0=______.

  • 2022-10-27 问题

    能正确表示变量x不属于区间&#91;-3,5&#93;的是( )。 A: 5<=x<=-3 B: x>=-3&&x<=5 C: x>=-3||x<=5 D: x5

    能正确表示变量x不属于区间&#91;-3,5&#93;的是( )。 A: 5<=x<=-3 B: x>=-3&&x<=5 C: x>=-3||x<=5 D: x5

  • 2022-06-19 问题

    设X1,X2,…,X5为来自总体X~N(12,4)的样本,试求1)P(X(1)<10);  2)P(X(5)<15).

    设X1,X2,…,X5为来自总体X~N(12,4)的样本,试求1)P(X(1)<10);  2)P(X(5)<15).

  • 2022-05-27 问题

    继续上题,为了程序编写简洁,要给数据框x中的6列重新命名为x1,x2,x3,x4,x5,x6,应该使用的命令是() A: ColNames(x) <- c("x1","x2","x3","x4","x5","x6") B: Names(x) <- c("x1","x2","x3","x4","x5","x6") C: colnames(x) <- c("x1","x2","x3","x4","x5","x6") D: colname(x) <- c("x1","x2","x3","x4","x5","x6")

    继续上题,为了程序编写简洁,要给数据框x中的6列重新命名为x1,x2,x3,x4,x5,x6,应该使用的命令是() A: ColNames(x) <- c("x1","x2","x3","x4","x5","x6") B: Names(x) <- c("x1","x2","x3","x4","x5","x6") C: colnames(x) <- c("x1","x2","x3","x4","x5","x6") D: colname(x) <- c("x1","x2","x3","x4","x5","x6")

  • 2022-06-08 问题

    设x为二进制整数,&#91;x&#93;补=11x1 x2 x3 x4 x5,若要x <-16,则x1~x5应满足什么条件?

    设x为二进制整数,&#91;x&#93;补=11x1 x2 x3 x4 x5,若要x <-16,则x1~x5应满足什么条件?

  • 2022-06-15 问题

    方程 x5 – 5 x = 1 至少存在一个实根的区间是 ……………………………( ) A: (-3,-2) B: (0,1) C: (1,2) D: (2,3)

    方程 x5 – 5 x = 1 至少存在一个实根的区间是 ……………………………( ) A: (-3,-2) B: (0,1) C: (1,2) D: (2,3)

  • 2022-06-08 问题

    已知数据x1,x2,x3,x4,x5的平均数为a,则数据4x1,4x2,4x3,4x4,4x5的平均数为______;4x1-2,4x2-2,4x3-2,4x4-2,4x5-2的平均数为______.

    已知数据x1,x2,x3,x4,x5的平均数为a,则数据4x1,4x2,4x3,4x4,4x5的平均数为______;4x1-2,4x2-2,4x3-2,4x4-2,4x5-2的平均数为______.

  • 2022-06-08 问题

    (a+b)x5等于多少7乘x-4=m+5×x=

    (a+b)x5等于多少7乘x-4=m+5×x=

  • 2021-04-14 问题

    设x为整数,[x]补 = 1,x1x2x3x4x5,,若要x< - 16,x1 ~x5应满足的条件是?

    设x为整数,[x]补 = 1,x1x2x3x4x5,,若要x< - 16,x1 ~x5应满足的条件是?

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