4又五分之六+九分之八÷[(9又五分之二－8.4）÷二分之五]加五又六分之一=26/5+(8/9)÷[(9.4-8.4)÷(5/2)]+31/6=26/5+(8/9)÷[1x(2/5)]+31/6=26/5+(8/9)x(5/2)+31/6=26/5+(20/9)+31/6=26/5+40/18+93/18=26/5+133/18=4...