æ»è·¯ç¨ä¸ºlen;
åä¸åè·¯ç¨é度Xï¼ç¨æ¶(len/2)/X ==>len/2X;
ååç¨ç¨æ¶Yå°æ¶ï¼å¹³åé度(X+15*ï¼1+Y)/2)=(len/2)/Y ==>2X+15+15Y=len/Y
æ»æ¶é´4å°æ¶ï¼ 4ï¼Y+len/2X; ==> 8X=2XY+len
å2å°æ¶è¡ç¨ä¸ºï¼ 2X = å2å°æ¶è¡ç¨ä¸ºï¼len-2X;
==>2X+15=len-2X ==>4X=len-15
解3å
æ¹ç¨å¼ï¼
2X+15Y+15=len/Y
2XY+len=8X
4X=len-15
==>X=len/4-15/4
==>2(len/4-15/4)+15Y+15=len/Y==>Y=len/30-1/2
==>2(len/4-15/4)*(len/30-1/2)+len=8*(len/4-15/4)=2len-30
==>(len-15)*(len-15)=60len-120*15
==>len*len-90len+135*15=0
==>(len-45)*(len-45)=0
==>len=45
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