... 400 -0, 7 14 30 × 100 27 60 × × 175 75 30 551,7 8 60 -1,5 14 30 × 100 34 60 × × 175 68 30 766 800 -4 .05 14 30 × 100 34 60 × × 175 68 30 1 100 11 20 -4 ,0 14 30 × 100 51 60 × × 175 51 30 1 500 1 600 -4 ,06 ... 100 -4 ,02 100 42 18 × × 175 60 72 134 1 40 -4 ,0 100 n1 14 30 × 192 200 -0, 9 14 30 × 14 30 × 51 18 14 30 × 175 × 51 × 72 14 30 × 100 60 18 × × 175 42 72 273,5 2 80 -2,23 14 30 × 100 21 60 × × 175 81 30 ... = 0, 05 14 400 (giờ) T2 = 0, 7 14 400 (giờ) T3 = 0, 25 14 400 (giờ) Vậy ta có : 1, 25 0, 5 0, 25 Ntd = 60 1[( 1,25 )2 817 0, 05 14 400 + ( 1,25 )2 817 0, 7 14 400 + ( 1,25 )2 817 0, 25 14 400 ] = 60( 588240...