)выражение)-1,5(6-х)-2(-х-3)+0,9(5х-1) 0,8(2y-3)+5(1.6-0.5y)-2(0.8-1.7) 5/6(1/5n+6)-2/3(9-1/2n)+5/8(4/5n-8)

1)//-1,5(6-х)-2(-х-3)+0,9(5х-1)= -9+1,5х+2х+6+4,5х-0,9=8х-3,9; 2)//0,8(2y-3)+5(1.6-0.5y)-2(0.8-1.7)= 1,6у-2,4+8-2,5у-1,6+3,4=-0,9у+7,4; 3)//5/6(1/5n+6)-2/3(9-1/2n)+5/8(4/5n-8)= 1/6n+5/1-6/1+1/3n+1/2n-5/1=n-6