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