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Nine grades Yangtze river exercise book mathematics winter vacation homework complete set of answers
Solution: Cut the conductor into two sections, namely xcm and ~ 20-x ~ cm.

X satisfies the following relationship.

﹙x/4﹚？ 0? 5+[﹙20-x﹚/4]？ 0? 5= 12

x？ 0? 5/ 16﹢﹙400-40x﹢x？ 0? 5﹚/ 16= 12

x？ 0? 5﹢400﹣40x﹢x？ 0? 5=272

2x？ 0? 5-40x﹢ 128=0

x？ 0? 5-20x﹢64=0

﹙x-40﹚﹙x- 16﹚=0

X = 4 or X = 16.

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