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1ãæä¸ç«ä½ï¼åºé¢æ¯ç±æ²çº¿ x = y² å æ²çº¿ x = 4 - 8y² æå´æçé¢ç§¯ï¼
2ã该ç«ä½ï¼å¨åç´äºyè½´çæ¹åä¸ç横æªé¢ï¼æ¯é«ä¸º h çé¿æ¹å½¢ã
3ãæ±è¯¥ç«ä½çä½ç§¯ã
4ãçæ¡åæåå¼å½¢å¼ã
解çï¼
ç±äºè¯¥ç«ä½å¨åç´äºyè½´çæ¹åä¸ç横æªé¢æ¯é«ä¸ºhçé¿æ¹å½¢ï¼
æ以该ç«ä½çæ¯é«ä¸º h ç棱æ±ä½ï¼prismï¼åªè¦æ±å¾åºé¢ç§¯ï¼ç¶åä¹é« h å³å¯ã
解èç«æ¹ç¨simultaneous equations:
x = y² , x = 4 - 8y² å¾ä¸¤ä¸ªäº¤ç¹åæ 为ï¼
Aï¼4/9ï¼-2/3ï¼Bï¼4/9ï¼2/3ï¼
åºé¢ç§¯ = â«[(4 - 8y²) - (y²)] dy (y : - 2/3â2/3) = 32/9
ç«ä½ä½ç§¯ = 32h/9ã
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