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 [˜A—§•û’öŽ®] W=|0.7*X-Y|+|0.7*X+Y|-5

              Z=(X+0.07143)^2+Y^2-1.5^2

              W*Z=0

 [•û’öŽ®‚Ì�À•WŒn] ’¼Œð�À•WŒn

 [•û’öŽ®‚Ì�À•W•Ï�”] X,Y

 [�F] W=�ƒ0, Z�„0 ‚Å”’�AZ=�ƒ0 ‚Å�Ô�B

 [•û’öŽ®‚Ì‹O�Õ] •û’öŽ® W=0 ‚Ì‹O�Õ‚Í”’‚ÌŠO‰�

                •û’öŽ® Z=0 ‚Ì‹O�Õ‚Í�Ô‚Æ”’‚Ì‹«ŠE�ü�B

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