Ответы и объяснения

2014-04-04T05:26:28+00:00
4.2(0.8+y)=8.82
4.2y + 3.36 = 8.82
4.2y=8.82-3.36
4.2y=5.46
y=5.46:4.2
y=1.3


5.6z-2z-0.7z+2.65=7
2.9z + 2.65 = 7
2.9z=7-2.65
2.9z=4.35
z=4.35:2.9
z=1.5