(5.6×3×1.7×0.9）÷（51×0.14×4×18）=?（15\56-13\42+11\30－9\20＋7\12-1\3)×2.005×390

(5.6×3×1.7×0.9）÷（51×0.14×4×18）=?（15\56-13\42+11\30－9\20＋7\12-1\3)×2.005×390
(5.6×3×1.7×0.9）÷（51×0.14×4×18）=?（15\56-13\42+11\30－9\20＋7\12-1\3)×2.005×390

(5.6×3×1.7×0.9）÷（51×0.14×4×18）=?（15\56-13\42+11\30－9\20＋7\12-1\3)×2.005×390
﹙5.6×3×1.7×0.9﹚÷﹙51×0.14×4×18﹚
＝﹙ 0.56÷0.14﹚×﹙3×17÷51﹚×﹙0.9÷18﹚÷4
＝4×1÷4×0.05
＝0.05
﹙15/56－13/42＋11/30－9/20＋7/12－1/3﹚×2.005×390
＝﹙1/7＋1/8－1/6－1/7＋1/5＋1/6－1/4－1/5＋1/＋1/4－1/3﹚×2.005×390
＝﹙1/8－1/3﹚×2.005×390
＝﹣5/24×2.005×390
＝523/160

(5.6×3×1.7×0.9）÷（51×0.14×4×18）=0.05
（15\56-13\42+11\30－9\20＋7\12-1\3)×2.005×390=97.74375