Question

4,1 (3х + 2у) - 2,3х + 1,8у при х +у = 3 4/5 упростите и найдите значение

Answer 1

4,1(3x + 2y) - 2,3x + 1,8y = 12,3x + 8,2y - 2,3x + 1,8y = 10x + 10y = 10(x+y)
x + y = 3 4/5 = (3*5 + 4)/5 = 19/5
10(x + y) = 10*19/5 = 19*2 = 38