Розкрити дужки і спростити вираз:
1.(5,3+ а) - (а+6,4)
2. -(х -5,8) - (11,3 - х)
3.-( 9,4 - х) + (-х +3,7)
4. -(а-б- 7,4) + (- 7,4+ а+б)
(Даю 40 балов)
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