看
[2)(1)TC(q)= q副本3-10q 2+17q+66tfc = TC (0) = 66,bait VC = TC-tfc = q 3-10q 2+17q(2)TVC(q)= q 3-10q 2+17q;duac=tc/q=q^2-10q+(66/q)+17 avc=tvc/q=q^2-10q+17,afc=tfc/q=66/q,mc=tc';=3q^2-20q+17【3】q = 10x tfc = 3 * 1000 = 3000 TVC = 50x = 50 *(q/10)= 5q TC = 5q+3000 AC = TC/q = 5+(3000/q)AFC = 3000/q AVC = 5mc = TC & # 39;= 5 【7】(1)q=12l+6l^2-zhi0.1l^3 apl=q/l=12+6l-0.1l^2 APL & # 39;=-0.2L+6=0,L=30,APL(最大)= APL(30)(2)mpl=dq/dl=12+12l-0.3l^2 mpl & # 39;=12-0.6L=0,L=20,mpl (max) = mpl (20) (3) apk = q/k,k是多少dao? 这个答案被网民采纳了。