°ïæÇó½âÕâ¸ö¸ßÊýÌ⣬лл£¬¸ø³ö¼ÆËã²½Öè 2.png ·µ»ØСľ³æ²é¿´¸ü¶à
ÇóÇúÃæz=x^2+2y^2ºÍz=6-2x^2-y^2Χ³ÉµÄÁ¢ÌåµÄÌå»ý ½â£º x^2+2y^2=6-2x^2-y^2 Á½ÇúÃæµÄ½»ÏßÔÚxy×ø±êÃæÉϵÄͶӰÇúÏßÊÇx^2+y^2£½2,ËùÒÔÕû¸öÁ¢ÌåÔÚxyÃæÉϵÄͶӰÇøÓòÊÇD£ºx^2£«y^2¡Ü2 Ìå»ýV£½¡Ò¡Ò(D) [(6-2x^2-y^2)£(x^2+2y^2)]dxdy Óü«×ø±ê£¬¦È£º0¡«2¦Ð ¦Ñ£º0¡«¡Ì2 £½3¡Òd¦È¡Ò(2£¦Ñ^2)¦Ñd¦Ñ£½6¦Ð
ÎÒÊdzԹÏȺÖÚ£¬°ï¶¥
Èçͼ£º QQͼƬ.png
ÇóÇúÃæz=x^2+2y^2ºÍz=6-2x^2-y^2Χ³ÉµÄÁ¢ÌåµÄÌå»ý
½â£º
x^2+2y^2=6-2x^2-y^2
Á½ÇúÃæµÄ½»ÏßÔÚxy×ø±êÃæÉϵÄͶӰÇúÏßÊÇx^2+y^2£½2,ËùÒÔÕû¸öÁ¢ÌåÔÚxyÃæÉϵÄͶӰÇøÓòÊÇD£ºx^2£«y^2¡Ü2
Ìå»ýV£½¡Ò¡Ò(D)
[(6-2x^2-y^2)£(x^2+2y^2)]dxdy
Óü«×ø±ê£¬¦È£º0¡«2¦Ð ¦Ñ£º0¡«¡Ì2
£½3¡Òd¦È¡Ò(2£¦Ñ^2)¦Ñd¦Ñ£½6¦Ð
ÎÒÊdzԹÏȺÖÚ£¬°ï¶¥
ÕâÑù²»Ö±¹Û¿ÉÒÔÖ±½ÓÓôúÂë»òͼÆ
£¬
Èçͼ£º
QQͼƬ.png