... LAp nip thilt hi di~n - di~n tu Phbng trien Him 100 Ix - 150 Ix 200 Ix - 300 Ix 300 Ix - 500 Ix 500 Ix - 750 Ix 500 Ix - 750 Ix 300 Ix - 500 Ix NhOb KMch SI;!D ... nghi~p mAu - ~c dinh ngu6n sang di~n 200 Ix - 300 Ix 200 Ix - 300 Ix 300 Ix - 500 Ix 500 Ix 1000 Ix 1000 Ix - Xac djnh pbucmg pbap chit!u sang va b~ d~n. - Xac dinh ... == H - a,85m (hlnh 7.22a) h = 3,9 - 0,85 == 3,05m - Chi s6 k i ch thl16"c K= _'_b_ ã .,.,.0'6".8~5.",8.",6-c-= 1,25 h(a+ b) 3,05(6,85 +8,6) - Xac...