56-(-5)=
51+(+5)=
23-(+5)
84+(-9)=
25.7+(-75)=
98.7-(-5.26)=
7.69-65.7=
(-54)+749
-63.8+751=
46-54=
6.46-(-4.82)=
46.7+4.62=
54.67+(-6.46)=
65.38-54.6=
53.67+(-5.4+6)=
456-56.4=
37.3+45.6=
26.86+4.65=
34.556-(5.46+76.2)=
43.5+(-5.664)=
567.45+48.654=
46.64-4892.34=
65.46+4620-6786=
45.489-563.42+379.5=
56+16.138-198.264=
654.368+49.138-529.13=
485.596+(-4892.13)=
349.13-(-415.23)+49.54=
158.569+(-642.26)-459.56=
求采納