几道数学题分解因式
(a-3)^2+(3-a)-16x^2y^2+12xy^5-8xz^3x^4-46x^2+25
4x^2-y^2-2y-1(^2即是平方,^4即是四次方)
非零数A,B满足4A^2+B^2=4AB,则B/A=