1. Выполните действия:

1) 4,2 + (–7,8); 4) –8,3 + 8,3; 7) –7,6 – (–8);

2) –8,6 + 11,3; 5) 6,8 – (–5,4); 8)

3) 6) 4,6 – 9,4;

пошаговое решение, УМОЛЯЮ, срочно!!! ​
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