设y=f(x)是一次函数,f(0)=1,且f(1),f(4),f(13)成等比数列,则f(2)+f(4)+…+f(2n)=________.
如图,弦AB与CD相交于⊙O内一点E,过E作BC的平行线与AD的延长线交于点P,已知PD=2DA=2,则PE=________.
若执行如图所示的程序框图,输入x1=1,x2=2,x3=3,=2,则输出的数等于________.
“∃x∈R,使得x2+(a-1)x+1<0”是真命题,则实数a的取值范围是________.
已知M={y|y=x2},N={y|x2+y2=2},则M∩N=________.
设复数z满足i(z+1)=-3+2i,则=________.