Ответы и объяснения

2014-03-06T09:49:18+00:00
1.5a+9.7b+5.8a+1.3b = (1.5+5.8)a + (9.7+1.3)b = 7.3a+11b


12.75a+1.85b+9.55a+3.5a = (12.75+9.55)a + (1.85+3.5)b = 22,3a+5.35b