(1)(—51)+(—37)
= -51-37
=-88
(2)(—45)+23
=23-45
=-22
(3)(+1又8分之3)+(—4分之3
=11/8-6/8
=5/8
(4)(—2.5)+(8.3)
=8.3-2.5
=5.8
(5)(+2.47)+(——2又10分之7
=2.47-2.7
=-0.23
(1)(—51)+(—37)
= -51-37
=-88
(2)(—45)+23
=23-45
=-22
(3)(+1又8分之3)+(—4分之3
=11/8-6/8
=5/8
(4)(—2.5)+(8.3)
=8.3-2.5
=5.8
(5)(+2.47)+(——2又10分之7
=2.47-2.7
=-0.23