ÌâÄ¿ÄÚÈÝ
Èçͼ¼×£¬Ä³Í¬Ñ§ÓÃÁ½¸ö»¬ÂÖ×é³ÉµÄ»¬ÂÖ×飬ÔÚͬһÖÖÈÆÉþ·½Ê½ÏÂÔÈËÙÌáÉý²»Í¬ÖÊÁ¿µÄÖØÎµÃµ½Á˶à×éÊúÖ±×÷ÓÃÔÚÉþ×Ó×ÔÓɶ˵ÄÀÁ¦FÓëÖØÎïËùÊÜÖØÁ¦GµÄ´óС¹Øϵ£¬²¢»æÖƳöÈçͼÒÒµÄF-GͼÏ󣨲»¼ÆÉþÖØÓëĦ²Á£©£®£¨1£©ÊÔ¸ù¾ÝͼÏó¼ÆË㶯»¬ÂÖËùÊÜÖØÁ¦G¶¯=______£»
£¨2£©ÔÚͼ¼×Öл³ö¸ÃͬѧµÄÈÆÉþ·½·¨£»
£¨3£©Óøû¬ÂÖ×éÌáÆðÖØΪ65NµÄÖØÎïʱ£¬»¬ÂÖ×éµÄ»úеЧÂÊÊÇ______£»
£¨4£©µ±»»ÁíÒ»ÖÖÈÆÉþ·½·¨Ê±£¬Óøû¬ÂÖ×éÌáÆð70NÖØÎïʱ£¬»¬ÂÖ×éµÄ»úеЧÂÊÊÇ______£®
¡¾´ð°¸¡¿·ÖÎö£º£¨1£©Í¼ÏóÖбíʾ³öÁËF-GÖ®¼äµÄ¹Øϵ£¬Òò´Ë¿É¶Á³ö¶à×é¾ßÌåµÄÊý¾Ý£¬¸ù¾ÝÕâЩÊý¾Ý¿Éͨ¹ýÁз½³ÌµÄ·½·¨£¬½â³ö¶¯»¬ÂÖµÄÖØÒÔ¼°³Ðµ£ÎïÖصÄÉþ×ӵĶÎÊý£»
£¨2£©ÒÀ¾ÝµÚÒ»Îʽâ³öµÄÉþ×ӵĶÎÊý¿É»³ö»¬ÂÖ×éµÄÈÆÏßÇé¿ö£»
£¨3£©¸ù¾ÝF=G×Ü¿ÉÇó³öÀÁ¦µÄ´óС£¬ÔÙ½«ÆäËûÊý¾ÝÒ»²¢´úÈ빫ʽ½øÐмÆË㣬¿ÉÇó³ö»úеЧÂʵĴóС£®
£¨4£©»»ÁíÒ»ÖÖÈÆ·¨Ê±£¬¶¯»¬ÂÖÉÏÓÐÈý¶ÎÉþ×Ó£¬¸ù¾Ý¹«Ê½¦Ç===¿ÉÇó»úеЧÂÊ£®
½â´ð£º½â£º£¨1£©ÓÉÊÜÁ¦·ÖÎö¿ÉÖª£¬F=£¨G+G¶¯£©£¬
¸ù¾ÝͼÏóÉÏÁ½¸öÌØÊâµã´úÈ룬20=£¨30+G¶¯£©¡¢Ù
40=£¨70+G¶¯£©¡¢Ú
½â¢Ù¢Ú×é³ÉµÄ·½³Ì×é¿ÉµÃ£ºG¶¯=10N£¬n=2£»
£¨2£©ÓÉn=2¿ÉÖªÓÐÁ½¶ÎÉþ×Óµõ×Ŷ¯»¬ÂÖ£¬¹ÊÈÆÉþ·½·¨ÈçͼËùʾ£»
£¨3£©ÓÉÌâÒâµÃ£¬´ËʱµÄÀÁ¦F=£¨G+G¶¯£©=£¨65N+10N£©=37.5N£¬
´Ëʱ»¬ÂÖ×éµÄ»úеЧÂʦÇ1=====86.7%£®
£¨4£©ÀÁ¦F1===N£»
»úеЧÂʦÇ====87.5%£®
¹Ê´ð°¸Îª£º£¨1£©10N £¨2£©n=2 £¨3£©86.7% £¨4£©87.5%
µãÆÀ£º½â¾ö´ËÌâµÄ¹Ø¼üÊÇÒª¸ù¾Ý»¬ÂÖ×éµÄÊ¡Á¦Ìص㣬ÒÀ¾ÝF=£¨G+G¶¯£©£¬½áºÏͼÏóÖеÄÊý¾Ý£¬Çó³ö¶¯»¬ÂÖµÄÖغͳе£ÎïÖصÄÉþ×ӵĶÎÊý£¬ÕâÑùºóÃæµÄÎÊÌâ±ã¶¼ÓÈжø½â£¬Çó»úеЧÂÊʱֻÐèÒªÕýÈ·ÔËÓù«Ê½¼´¿É£®
£¨2£©ÒÀ¾ÝµÚÒ»Îʽâ³öµÄÉþ×ӵĶÎÊý¿É»³ö»¬ÂÖ×éµÄÈÆÏßÇé¿ö£»
£¨3£©¸ù¾ÝF=G×Ü¿ÉÇó³öÀÁ¦µÄ´óС£¬ÔÙ½«ÆäËûÊý¾ÝÒ»²¢´úÈ빫ʽ½øÐмÆË㣬¿ÉÇó³ö»úеЧÂʵĴóС£®
£¨4£©»»ÁíÒ»ÖÖÈÆ·¨Ê±£¬¶¯»¬ÂÖÉÏÓÐÈý¶ÎÉþ×Ó£¬¸ù¾Ý¹«Ê½¦Ç===¿ÉÇó»úеЧÂÊ£®
½â´ð£º½â£º£¨1£©ÓÉÊÜÁ¦·ÖÎö¿ÉÖª£¬F=£¨G+G¶¯£©£¬
¸ù¾ÝͼÏóÉÏÁ½¸öÌØÊâµã´úÈ룬20=£¨30+G¶¯£©¡¢Ù
40=£¨70+G¶¯£©¡¢Ú
½â¢Ù¢Ú×é³ÉµÄ·½³Ì×é¿ÉµÃ£ºG¶¯=10N£¬n=2£»
£¨2£©ÓÉn=2¿ÉÖªÓÐÁ½¶ÎÉþ×Óµõ×Ŷ¯»¬ÂÖ£¬¹ÊÈÆÉþ·½·¨ÈçͼËùʾ£»
£¨3£©ÓÉÌâÒâµÃ£¬´ËʱµÄÀÁ¦F=£¨G+G¶¯£©=£¨65N+10N£©=37.5N£¬
´Ëʱ»¬ÂÖ×éµÄ»úеЧÂʦÇ1=====86.7%£®
£¨4£©ÀÁ¦F1===N£»
»úеЧÂʦÇ====87.5%£®
¹Ê´ð°¸Îª£º£¨1£©10N £¨2£©n=2 £¨3£©86.7% £¨4£©87.5%
µãÆÀ£º½â¾ö´ËÌâµÄ¹Ø¼üÊÇÒª¸ù¾Ý»¬ÂÖ×éµÄÊ¡Á¦Ìص㣬ÒÀ¾ÝF=£¨G+G¶¯£©£¬½áºÏͼÏóÖеÄÊý¾Ý£¬Çó³ö¶¯»¬ÂÖµÄÖغͳе£ÎïÖصÄÉþ×ӵĶÎÊý£¬ÕâÑùºóÃæµÄÎÊÌâ±ã¶¼ÓÈжø½â£¬Çó»úеЧÂÊʱֻÐèÒªÕýÈ·ÔËÓù«Ê½¼´¿É£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿