-
1 A B C D E AB 400 BE 1700
⑴ DC 300 DC ⑵
⑵ ⑵ ⑵
⑵ AB ⑵ AC 700 ⑵ BD ⑵ BD CE ⑵ CE ⑵ AE 1000 AE AE EC ⑵
AE BC AD BE ⑵ ⑵
⑶
⑵ 400+700+300+1000=2400 5