по рисунку найти сумму векторов 

а)АВ+ВД+ДС

б)АД+АС+СВ

в)АВ+ВС+СД+ДА 

г)АВ+ВС+СД

д)ДА+СД+АВ

е)АС+ВД+СВ

ж)АВ+СА+ВД+ДС

з)АВ-АД 

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