• 2022-06-12 问题

    若a>1,b>1,且lg(a+b)=lga+lgb,则lg(a-1)+lg(b-1)的值(  )

    若a>1,b>1,且lg(a+b)=lga+lgb,则lg(a-1)+lg(b-1)的值(  )

  • 2022-06-09 问题

    对于非零的实数a、b,规定a⊕b=1/b-1/a.若2⊕(2x-1)=1,则x=(  )

    对于非零的实数a、b,规定a⊕b=1/b-1/a.若2⊕(2x-1)=1,则x=(  )

  • 2022-06-01 问题

    a,b,c为正数,a+b+c=1证:(1)(1/a+1)(1/b+1)(1/c+1)>=64(2)(1/a-1)(1/b-1)(1/c-1)>=8

    a,b,c为正数,a+b+c=1证:(1)(1/a+1)(1/b+1)(1/c+1)>=64(2)(1/a-1)(1/b-1)(1/c-1)>=8

  • 2022-05-26 问题

    证明:如果(G,°)是群,则对每个a,b∈G有:(a°b)-1=b-1°a-1。

    证明:如果(G,°)是群,则对每个a,b∈G有:(a°b)-1=b-1°a-1。

  • 2022-06-08 问题

    In a two-factor factorial design, suppose factor A has a levels and factor B has b levels. What are the degrees of freedom for factor A, factor B, and the interaction between factor A and B? A: a;b;ab B: a-1;b-1;(a-1)(b-1) C: a-1;b-1;ab D: a-1;b-1;ab-1

    In a two-factor factorial design, suppose factor A has a levels and factor B has b levels. What are the degrees of freedom for factor A, factor B, and the interaction between factor A and B? A: a;b;ab B: a-1;b-1;(a-1)(b-1) C: a-1;b-1;ab D: a-1;b-1;ab-1

  • 2022-06-14 问题

    A.(A-1)*(B-1)B.A-1C.(A-1)*BD.A*B A: (A-1)*(B-1) B: A-1 C: (A-1)*B D: A*B

    A.(A-1)*(B-1)B.A-1C.(A-1)*BD.A*B A: (A-1)*(B-1) B: A-1 C: (A-1)*B D: A*B

  • 2022-05-30 问题

    两因子析因设计中,若因子A有a个水平,因子B有b个水平,则因子A、因子B以及AB交互作用的自由度各是多少? A: a;b;ab B: a-1;b-1;(a-1)(b-1) C: a-1;b-1;ab D: a-1;b-1;ab-1

    两因子析因设计中,若因子A有a个水平,因子B有b个水平,则因子A、因子B以及AB交互作用的自由度各是多少? A: a;b;ab B: a-1;b-1;(a-1)(b-1) C: a-1;b-1;ab D: a-1;b-1;ab-1

  • 2022-05-28 问题

    如果a(-1 to 2),则函数LBound(a)的返回值是() A: A-1和-2 B: B-1 C: C-2 D: D2

    如果a(-1 to 2),则函数LBound(a)的返回值是() A: A-1和-2 B: B-1 C: C-2 D: D2

  • 2022-06-12 问题

    若a>1,b>1,且lg(a+b)=lga+lgb,则lg(a-1)+lg(b-1)的值等于( ) A: 0 B: lg2 C: 1 D: -1 E: (E) 以上结论均不正确

    若a>1,b>1,且lg(a+b)=lga+lgb,则lg(a-1)+lg(b-1)的值等于( ) A: 0 B: lg2 C: 1 D: -1 E: (E) 以上结论均不正确

  • 2021-04-14 问题

    B-1细胞的特点是:

    B-1细胞的特点是:

  • 1 2 3 4 5 6 7 8 9 10