a=(3,4),b=(4,3),c=(3m+4n,4m+3n)向量a⊥向量ca.c=9m+12n+16m+12n=25m+24n=0向量c的摩=1|c|^2=1=(3m+4n)^2+(4m+3n)^2=9mm+16nn+24mn+16mm+9nn+24mn=m(25m+24n)+25nn+24mn=25nn-(24*24nn/25)=1nn=25/49得n=5/7,m=-24/...