A:Losing her bike
B:because of her bike
C:Lost her bike
D:Because she lost her bike
给出如下四个命题①若“p且q”为假命题,则p、q均为假命题②命题“若xy=0则x=0或y=0”的否命题为“若xy≠0,则x≠0且y≠0”③“任意x∈R,x2+1≥1”的否定是“存在x∈R,x2+1≤1”④在△ABC中,“A>B”是“sinA>sinB”的充要条件其中正确的命题的个数是( )
设复数z满足(z+i)(2+i)=5(i为虚数单位),则z=____