Ответы и объяснения

2014-04-09T15:33:58+00:00
1)1y-0.5-0.5+0.2y+1=0
1.2y-1+1=0
1.2y=0
y=0
2)0.9x-0.3+0.2=0.5-x-0.1
0.9x-0.1=0.4-x
0.9x+x=0.4+0.1
1.9x=0.5
x=0.5/1.9
x=2.6