Question

3.7а-2.5b-7.5b+0.3a+10 при а=-1.5, b=0.12    

-1.6x+0.2y+2.6x-0.1-3.2y при х=1/2 y=-2/3

Answer 1

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 = 
$frac{3}{6} + frac{22}{6} -0.1$ = $frac{25}{6} - 0.1 = 4 frac{1}{2} -0.1=4.5-0.1=4.4$