3又4分之一+(负2又5分之3)+5又4分之3+(负8又5分之2)
= (3 +1/4) - (2+3/5) + (5 + 3/4) - (8 + 2/5)
= (3 -2 +5 - 8) + (1/4 - 3/5 + 3/4 - 2/5)
= (-2) + (1 -1)
= -2 + 0
= -2
3又4分之一+(负2又5分之3)+5又4分之3+(负8又5分之2)
= (3 +1/4) - (2+3/5) + (5 + 3/4) - (8 + 2/5)
= (3 -2 +5 - 8) + (1/4 - 3/5 + 3/4 - 2/5)
= (-2) + (1 -1)
= -2 + 0
= -2