Х-3.8-2.6=1.5 х-6.4=1.5 х=7.9 -х+3.8-2.6=1.5 -х+1.2=1.5 х=-0.3 -(х-6.4)=1.5 -х+6.4=1.5 х=4.9 -(-х+1.2)=1.5 х-1.2=1.5 х=2.7 7.9-0.3+4.9+2.7=15.2 Ответ:15.2
15.2 Ответ а.