问题:已知函数f(x)={(1-tan2x)/(1+tan2x)}2 ,则f(x)的最小正周期是( ).(A)2π.(B)3/2π.(C)π.(D)π/2 ....
Saturday, April 27, 2024
问题:已知向量a,b,c是三个具有公共起点的非零向量,且|a|=2|b|=2,又a·b=-1, 〈a-c,b-c 〉=π/3 ,则当|a-c|=7时,向量a与c的夹角是____....
Saturday, April 27, 2024
问题:若数列{xn}满足条件x1=3,xn+1=(x2n+1)/2xn ,则该数列的通项公式xn=____....
Saturday, April 27, 2024
问题:已知A,B是抛物线y2=4x上的两个动点,且|AB|=3,则当AB的中点M到y轴的距离最短时,点M的横坐标是____....
Saturday, April 27, 2024
问题:The minimum value of the function y=√(x2-2x+5)+√(x2+4) is ( ).(A)4.(B)3√2.(C)2√5.(D)√17....
Saturday, April 27, 2024
问题:How many positive roots does the equation (x+1/2)2012-x2012+2x+1/2=0 have? ____....
Saturday, April 27, 2024
问题:已知数列{an}中,a1=2,an+1=(1+an)/(1-an).记数列{an}的前n项的乘积为∏n,则∏2012=____....
Saturday, April 27, 2024
问题:已知向量a,b,c是三个具有公共起点的非零向量,且|a|=2|b|=2,又a·b=-1, 〈a-c,b-c 〉=π/3 ,则当|a-c|=7时,向量a与c的夹角是____....
Saturday, April 27, 2024
问题:已知数列{an}中,a1=2,an+1=(1+an)/(1-an).记数列{an}的前n项的乘积为∏n,则∏2012=____....
Saturday, April 27, 2024
问题:三角式√6tan10°+4√2cos80°的值等于____....
Saturday, April 27, 2024
问题:已知点M是△ABC所在平面内的一点,且满足MA2+MB2+MC2=4,那么△ABC三条边长之积AB·BC·CA的最大值是____....
Saturday, April 27, 2024
问题:已知函数f(x)={(1-tan2x)/(1+tan2x)}2 ,则f(x)的最小正周期是( ).(A)2π.(B)3/2π.(C)π.(D)π/2 ....
Saturday, April 27, 2024
问题:已知点M是△ABC所在平面内的一点,且满足MA2+MB2+MC2=4,那么△ABC三条边长之积AB·BC·CA的最大值是____....
Saturday, April 27, 2024