Спростити вираз
1) 2,7х+3,2х якщо х=13
2) 1,2a+4,9a-9,8a якщо х=1,7
3) 7,8•2,22+7,8•3,14+7,8•4,36=
4) 9,9•2,7+9,9•3,1-9,9•9,8=
Будь ласка я прошу Вас!!! ДЯКУЮ
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