若△ABC的内角A,B,C满足6sinA=4sinB=3sinC,则cosB=()
设全集U={a、b、c、d},A={a、c},B={b},则A∩(CuB)=(A) (B){a} (C){c} (D){a,c}
命题“若,则”的逆否命题是( )
设集合,则( )
设全集U={1,3,5,6,8},A={1,6},B={5,6,8},则(CUA)∩B= (A){6} (B){5,8} (c){6,8} (D){3,5,6,8}
如果U={x|x是小于9的正整数},A={1,2,3,4},B={3,4,5,6},那么CUA∩CUB=