Tính a) 5/8 + 2 1/4 . 1 2/3 - 1/4 . 5/6 b) (13 9/11 : 38/49 - 5 2 /11
Giải thích
a)
58+214.123−14.56=58+94.53−524=54.12+3−16=54.103=256
b)
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