Question

Разложить вектор.....................................

Answer 1

AB=a,AC=c,CD=-AB=-a
AD=BC=AC+CD=c-a
AK=1/7AD=1/7c-1/7a
AM=AB+4/7BC=a+4/7c-4/7a=3/7a+4/7c
KM=AM-AK=3/7a+4/7c-1/7c+1/7a=4/7a+3/7c