Tính (13 9/11:38/49-5 2/11:38/49):(49/38. 5/11)
Giải thích
13911:3849−5211:3849:4938.511=13+911.4938−5+211.4938:4938.511
=4938.13−5+911−211:4938.511=4938.8+711:4938.511=8+711:511=19
13911:3849−5211:3849:4938.511=13+911.4938−5+211.4938:4938.511
=4938.13−5+911−211:4938.511=4938.8+711:4938.511=8+711:511=19