1)AN=AB+BN=AB+2/5*BC=AB+2/5*AD
векторы BC и AD равны
2) AN=AC+CN=AC+(-3/5*BC)=AC-3/5AD
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1)AN=AB+BN=AB+2/5*BC=AB+2/5*AD
векторы BC и AD равны
2) AN=AC+CN=AC+(-3/5*BC)=AC-3/5AD