已知,AB=8,P是AB黄金分割点,PA>PB,则PA的长为 .
计算:-3a+(-3a)=________;
计算:(m-n)(m+n)=________;
计算:m-n-(m+n)=_________;
计算:51×49=_________.
(1)(3a-4b)()=9a2-16b2;(2)(4+2x)()=16-4x2; (3)(-7-x)()=49-x2;(4)(-a-3b)(-3b+a)=_______.