2.Спростіть вираз :
1) – 2,4а • ( -5в) ;
2) 9а- 6а + 8в -3в;
3) а + ( 3а-10) – ( 15-а);
4) -4( с-4) + 7(с+2).
Пожалуйста!!!!!!!Срочно нужно!
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