1) СМ=СА+АМ=а+АМ.
2) АВ=АС+СВ=-а+в.
3) АМ=(1/3)АВ=(1/3)(-а+в).
4) СМ=а+(1/3)(-а+в)=(2/3)а+(1/3)в.
Ответ: СМ=(2/3)а+(1/3)в.
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1) СМ=СА+АМ=а+АМ.
2) АВ=АС+СВ=-а+в.
3) АМ=(1/3)АВ=(1/3)(-а+в).
4) СМ=а+(1/3)(-а+в)=(2/3)а+(1/3)в.
Ответ: СМ=(2/3)а+(1/3)в.