-23+(+21)-(-79)-37
= -2 +79 -37
= 79 -2 -37
= 79 -39
=40
9分之4减8分之5加5分之3减9分之4加8分之3减5分之4=
= 4/9 -5/8 + 3/5 -4/9 + 3/8 -4/5
= -5/8 + 3/8 + 3/5 -4/5
= -2/8 -1/5
= -10/40 -8/40
= -18/40
= -9/20
-23+(+21)-(-79)-37
= -2 +79 -37
= 79 -2 -37
= 79 -39
=40
9分之4减8分之5加5分之3减9分之4加8分之3减5分之4=
= 4/9 -5/8 + 3/5 -4/9 + 3/8 -4/5
= -5/8 + 3/8 + 3/5 -4/5
= -2/8 -1/5
= -10/40 -8/40
= -18/40
= -9/20