å
æ被积å½æ°åå¼ï¼å°±æ¯ (a-b)/c = a/c - b/c
ç¶ååå¾®å ã第ä¸ä¸ªï¼åæ¯æåº 3 ï¼ç¶å dx/3 = 1/2*d(2x/3)ï¼ä¸»è¦æ¯åæ¯éæ 2x/3 ï¼
第äºä¸ªï¼d(9-4x^2) = -8xdxï¼å æ¤åç³»æ° -1/8 ï¼æ³¨æåæ¥è¿æ个åå·ï¼å°±æäº + 1/8 ã
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