Найти а1 и d арифметической прогрессии, если: а6=20 s6=102

200х+20у=640 |: 20         10x+y=32                   x=3, 20х+10у=80     |: 10           2x+y=8                     y=8-2·3,y=2                                         8x=24, x=24: 8,x=3 ответ: (3; 2)

Ihave a rather complicated character. i can be quick-tempered, can be balanced. i also responsive and attentive. always help your loved ones. even if i can't fully help, i will try to do what the strength. all actions ponder long, weighing all the pros and cons. don't like to rush in serious matters, so i do not want people to laugh. i am very friendly, but do not accept self-interest in friendship. i think all level-headed person, although there are in me some anxiety and restlessness. i am often aggressive and resentful. offended at the slightest provocation, but quickly forgive wrongs and remember with a smile.