... thit(cm2) Gi B 6,84 cm2 5,05 cm2 212 + 314 212 + 14 + 216 212 + 314 212 + 316 314 + 216 314 + 216 14 + 216 14 + 216 214 + 16 Gi C 5,47 cm2 212 + 214 14 + 216 212 + 214 Cỏc phng ỏn b trớ thộp So sỏnh ... - 71, 893 0,200 16 1,557 0,200 16 1,557 18 5,522 10 1,7 81 -0 ,13 3 -10 7,436 -0, 311 -2 51, 2 21 11, 848 315 ,10 3 23,696 249,304 0,044 35,543 -53,807 18 3,978 18 3,978 45,707 -19 ,689 -340,5 71 -85, 015 C -85, 015 ... 214 (6,88cm ) 412 + 16 (5,34cm ) 216 + 14 (5,34cm ) 216 + 14 (8,64cm ) 414 + 16 (6,531cm ) 312 + 216 (5,609cm ) 210 + 16 (5,559cm ) 312 + 16 (8 ,17 1cm ) (7,41cm ) 212 + 14 + 216 (5,091cm...