Toán Lớp 5: tính 8/5 + 7/6 + 5/9 -2 = =======-

Question

Toán Lớp 5:  tính  8/5 + 7/6 + 5/9 -2 = ........................................................................................                                = ......................................................................................... 3 - 5/6 -4/9 + 32/24 = .......................................................................................                                   = .........................................................................................

baoquyen · Answer

8/5 + 7/6 + 5/9 -2     =48/30+35/30+5/9-2     =31/10+5/9-2     =279/90+50/90-2     =329/90-180/90     =149/90     3-5/6-4/9+32/24     =72/24-20/24+32/24-4/9     =52/24+32/24-4/9     =84/24-4/9     =252/72-32/72     =220/72=110/36=55/18

tuyetanhthu · Answer

Lời giải và giải thích chi tiết:     8/5 + 7/6 + 5/9 - 2   = 144/90 + 105/90 + 50/90 - 180/90   = (144 + 105 + 50 - 180)/90   = 119/90   3 - 5/6 - 4/9 + 32/24   = 3 - 5/6 - 4/9 + 4/3   = 162/54 - 45/54 - 24/54 + 72/54   = (162 - 45 - 24 + 72)/54   = 165/54   = 55/18