3(2x + y) - 4(2y-x) если x =0.2 y = -2.5

Question

3(2x + y) - 4(2y-x) если x =0.2 y = -2.5

Answer 1

3( 2x + y) - 4( 2y - x) = 6x + 3y - 8y + 4x = 10x - 5y = 5( 2x - y)

При x = 0,2, y = - 2,5 :
5 ( 2x - y) = 5 ( 2×0,2 - (- 2,5)) = 5 ( 0,4 + 2,5) = 5 ×2,9 = 14,5

Ответ: 14,5