(a2+b2)(x2+y2)=( )2+( )2=( )2+( )2
问题描述:
(a2+b2)(x2+y2)=( )2+( )2=( )2+( )2
答
(a2+b2)(x2+y2)=( ax-by)2+(ay+bx )2=(bx-ay )2+(by+ax )2
(a2+b2)(x2+y2)=( )2+( )2=( )2+( )2
(a2+b2)(x2+y2)=( ax-by)2+(ay+bx )2=(bx-ay )2+(by+ax )2