Ответы и объяснения

2014-02-28T14:07:41+00:00
1)(x-50.6)+2.15=42.9
x-50.6=42.9-2.15
x-50.6=40.75
x=40.75+50.6
x= 91.35 
2) 31.28-(m+4.2)= 15.093
m+4.2=31.28-15.093
m+4.2=16.187
m=11.987