Дам 60 баллов!!! розкрийте дужки та спростіть вираз; 1) −(a - b) – b;
2)– c + (c - d);
3)–(2,7 - a) + (-a + 1,8)
4)–(-6,2 + a + b) – (a - b + 10,9)
помогите пожалуйста!!!!!!!!!!!!!!!!!!!!!!!​
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