Розкрити дужки та звести подібні доданки
1. 6а - 7х(12-3а)
2. 1,6х(с-8) + 0,4 х(8-3с)
3. 0(9\16) х (5(1\3)а - 0(4\15)у) - 0(7\23) х(3(2\7)а - 2(4\21) у)
(Даю 40 балов)
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