6 5/9(n-9)+2 2/9(18-n) при n=0.3

6 5/9n-(6 5/9*9)+2 2/9*18-2 2/9n=6 5/9n-59+40-2 2/9n=4 1/3n-19 при n=0.3 4 1/3*0.3-19=13/3*3/10-19=1.3-19=-17.7