Дан параллелепипед ABCDA1B1C1D1. Найдите сумму векторов:
1. АА1 + A1B1 + B1C1
2. AB + B1C1 + BB1 + C1D1
3. BB1 + AD + D1D + CB
1. АА1 + A1B1 + B1C1
2. AB + B1C1 + BB1 + C1D1
3. BB1 + AD + D1D + CB
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