十九又四分之三乘负十一 =(20-1/14)*(-11) =-220+11/14 =--3069/14 [一又二十四分之一减(3/8+1/6-¾﹚×24]÷﹙-5﹚ =[1+1/24-9-4-18]/(-5) =[-30+1/24]/(-5) =6-5/24 =139/24