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 можно в столбик ​
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