Ответы и объяснения

2014-02-17T19:39:58+04:00
4,5-(m+2.8)=4.5-(-2.2+2.8)=4.5+2.2+2.8=4.5+5=9.5
-n+(3.8-n)+4.3=-0.8+(3.8-0.8)+4.3=-0.8+3.8-0.8+4.3=8.1-1.6=6.5