1.æ±è¯:m²ï¼n²ï¼m²+n²ï¼2mnï¼mï¼nï¼mï¼næ¯æ£æ´æ°ï¼æ¯ä¸ç»å¾è¡æ°ã
å 为(m²ï¼n²)²=m^4-2m^2n^2+n^4ï¼(m²+n²)²=m^4+2m^2n^2+n^4ï¼(2mn)²=4m²n²
æ以
(m²ï¼n²)²+(2mn)²=(m²+n²)²
ä»è
m²ï¼n²ï¼m²+n²ï¼2mnï¼mï¼nï¼mï¼næ¯æ£æ´æ°ï¼æ¯ä¸ç»å¾è¡æ°ã
2ãåªè¦ä¸é¢çmån,nå1ï¼å³å¯å¾åºâ³ABCæ¯ç´è§ä¸è§å½¢ï¼
3ã设è
°ä¸ºa,åºè¾¹=2b,å
2a+2b=32,8^2+b^2=a^2
æ以
a=10,b=6
æ以é¢ç§¯=1/2*8*12=48ã
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