只作m>3的情况﹙m<3留个楼主.﹚
B﹙3,3﹚,∴k=9=mn.
s=﹙m-3﹚n+﹙3-n﹚×3=18-6nn=﹙18-s﹚/6m=9/n=54/﹙18-s﹚
⑴k=9E﹙54/﹙18-s﹚,0 ﹚
⑵P﹙4, 2.25 ﹚
⑶s=18-54/m
只作m>3的情况﹙m<3留个楼主.﹚
B﹙3,3﹚,∴k=9=mn.
s=﹙m-3﹚n+﹙3-n﹚×3=18-6nn=﹙18-s﹚/6m=9/n=54/﹙18-s﹚
⑴k=9E﹙54/﹙18-s﹚,0 ﹚
⑵P﹙4, 2.25 ﹚
⑶s=18-54/m