①(2014•达州中考)一Haveyoueveranamusementpark?—YesIhave.IFunTimesAmusementParklastyear.A.beento;havegonetoB.goneto;havebeentoC.goto;wenttoD.beento;wentto
①(2014 •达州中考) 一 Have you ever an amusement park?
—Yes I have. I Fun Times Amusement Park last year.
A. been to;have gone to B. gone to;have been to C. go to;went to D. been to;went to
设a=(√5-1)/2,求(a^5+a^4-2a^3-a^2-a+2)/a^3-a∵2a=√5-1 2020-04-05 …
三阶实对称矩阵,R(A)=2,A^2+2A=0,求特征值.都得到a(a+2)=0.为什么得到a=0 2020-04-13 …
4．已知集合A={y｜y=－1＋x－2x2,x∈R},若y∈A,则有（）.（A）y∈Q（B）y∈Q 2020-05-22 …
设两个关系R(A,B)和S(A,C)。则下列关系代数表达式中必与等价的是A.ⅡA.B.C(R×S)B 2020-05-23 …
通分：（1）1/2x^3y,4/3xz^2,5/4xz(2)x/1-a,y/(a-1)^2,z/( 2020-06-06 …
通分：（1）1/2x^3y,4/3xz^2,5/4xz(2)x/1-a,y/(a-1)^2,z/( 2020-07-30 …
一、已知数集M满足条件：若a∈M,则(1+a)/(1-a)∈M（a≠0,a≠±1）（1）若3∈M, 2020-07-30 …
很难!指数函数求极值y=(a/r-b/r^2)*(1-1/(1+r)^x)+b/r*x/(1+r) 2020-08-02 …
已知f(x)=(1/2)x,a,b∈R+,A=f(A+B)/2,G=f根号ab...则AGH的大小关 2020-11-03 …
函数f[x]=logaXa大于0,且a不等于1,在2,3上最大值为1,则a=当a大于1时,f（x）图 2021-01-15 …