<span>а) 4m – 6m – 3m+7+m=-4m+7</span>
<span><span>б) -8(к-3)+4(к-2)-2(3к+1)=-8k+24+4k-8-6k-2=-10k+14</span></span>
<span>3*2 / (1 +3/2) = 6/2.5 = 2.4 рубля за фунт</span>