Réponses

2013-10-09T09:32:21+02:00
-3+(-523)+234+(-75)+267
=-3-523+234-75+267
=(234+267)+(-3-523-75)
=501-601
= -100

-2-95-38+36 
=(-38+36-2)-95
= -4-95
= -99

7+(-13)-(+78)+(-26)
=7-13-78-26
=-6-78-26
= -110

22.5+70+(-235.2)-(-60.7)
=22.5+70-235.2+60.7
=(70+60.7)+(22.5-235.2)
=130.7+ (-212.7)
=130.7-212.7
= -82