упрастите выражение: 5(х+1,4у)-0,8(2х+у) 2/3(х-у+z)-(2/3х-у+z)

Question

упрастите выражение: 5(х+1,4у)-0,8(2х+у)
2/3(х-у+z)-(2/3х-у+z)

Answer 1

5(х+1,4у)-0,8(2х+у) = 5x+7y-1,6x-0,8y = 3,4x+6,2y
2/3(х-у+z)-(2/3х-у+z) = 2/3x-2/3y+2/3z-2/3x+y-z = 1/3y-1/3z = y/3-z/3