855. Упростите выражение, найдите его значение:
1) 15,2х + 8,3 + 4,6х + 7,5 при хе 0,5;
2) 19,8у – 12,6y +4,37 + 3,1у при у 2,1;
3) (6,5x - 2,7x) + (13,4х – 5,2х) при х 0,7.​
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