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x4 =

1765/216-1/216*166991^(1/2) y4 =

1375/216-520675/36070056*166991^(1/2)

>> x4 =1765/216-1/216*166991^(1/2) x4 =

6.2794

>> y4 =1375/216-520675/36070056*166991^(1/2) y4 =

0.4669

>> 5.6*(x4^2+(y4-5)^2)^0.5+7.2*y4+6*((x4-15)^2+(y4-8)^2)^0.5+5*(21+7.2)

ans =

256.8742 %¹«Ë¾Ò»µÄ¹ÜÏß½¨Éè·ÑÓÃ

>> 5.6*(x4^2+(y4-5)^2)^0.5+7.2*y4+6*((x4-15)^2+(y4-8)^2)^0.5+5*(24+7.2)

ans =

271.8742 %¹«Ë¾¶þµÄ¹ÜÏß½¨Éè·ÑÓÃ

>> 5.6*(x4^2+(y4-5)^2)^0.5+7.2*y4+6*((x4-15)^2+(y4-8)^2)^0.5+5*(20+7.2)

ans =

251.8742 %¹«Ë¾Ò»µÄ¹ÜÏß½¨Éè·ÑÓÃ

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