Ответы и объяснения

2013-10-27T15:29:32+04:00
а) 3.7а-2.5b-7.5b+0.3a+10 = 4a-10b = 4*(-1.5)-10*0.12+10 = -6 - 1.2+10 = 2.8
б) 
-1.6x+0.2y+2.6x-0.1-3.2y = х-3y-0.1 =  \frac{1}{2} 3 (-\frac{2}{3}) -0.1 = 
 \frac{3}{6} +  \frac{22}{6} -0.1 \frac{25}{6} - 0.1 = 4 \frac{1}{2} -0.1=4.5-0.1=4.4