ÌâÄ¿ÄÚÈÝ
½üÄêÀ´£¬ÎÒ¹ú·¿µØ²úÒµ·¢Õ¹Ñ¸ËÙ£¬Ô½À´Ô½¶àµÄ¾ÓÃñÇÇǨоӣ¬¾ÓסÌõ¼þºÍ»·¾³ÏÔÖø¸ÄÉÆ¡£Çë¶Áͼ 1-5£¬ÔËÓÃÒÔϹ«Ê½¼°Ïà¹Ø֪ʶ»Ø´ð£¨1£©¡¢£¨2£©Ìâ¡£¢ÙijµØÕýÎçÌ«Ñô¸ß¶ÈµÄ´óС£ºH =90¡ã- |¦Õ-¦Ä|ʽÖÐ H ΪÕýÎçÌ«Ñô¸ß¶È£»¦ÕΪµ±µØγ¶È£¬È¡ÕýÖµ£»¦ÄΪ̫ÑôÖ±ÉäµãµÄγ¶È£¬µ±µØÏÄ°ëÄêÈ¡ÕýÖµ£¬¶¬°ëÄêÈ¡¸ºÖµ¡£¢Útg35¡ã¡Ö0.7 tg45¡ã=1 tg60¡ã¡Ö1.732£¨1£©·¿µØ²ú¿ª·¢ÉÌÔÚij³ÇÊУ¨±±Î³ 30 ¶È£©½¨ÔìÁËÁ½´±ÉÌƷסլ¥£¬Ä³»§¾ÓÃñǨµ½Á˱±Â¥Ò»²ãµÄÒ»Ì×·¿×Ó£¬ÓÚ´º½Úǰס½øºó·¢ÏÖÕýÎçÇ°ºóÌ«Ñô¹âÏß±»ÄÏÂ¥µ²×¡¡£
ÇëÎÊ£¬¸Ã·¿×ÓÒ»ÄêÕýÎçÌ«Ñô¹âÏß±»ÄÏÂ¥µ²×¡µÄʱ¼ä´óÔ¼ÊÇ£¨£©
A.1¸öÔ¡¡¡¡¡¡¡¡B.3¸öÔ¡¡¡¡¡¡¡¡¡¡¡¡C.6¸öÔ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D.9¸öÔÂ
Ϊ±ÜÃâÕâÖÖ¾À·×£¬·¿µØ²ú¿ª·¢ÉÌÔÚ½¨Â¥Ê±£¬Ó¦¸Ãʹ´ËÂ¥ËùÓз¿ÎÝÔÚÕýÎçʱÖÕÄ궼Äܱ»Ì«ÑôÕÕÉä¡£ÄÇôÔÚÁ½Â¥¼ä¾à²»±äµÄÇé¿öÏ£¬ÄÏÂ¥µÄ¸ß¶È×î¸ßԼΪ£¨£©
A.20Ãס¡¡¡¡¡¡¡¡¡B.30Ãס¡¡¡¡¡¡¡¡¡C.40Ãס¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D.50Ã×
¡¾Ð¡Ìâ1¡¿£Ã
¡¾Ð¡Ìâ2¡¿£Â
½âÎö:
¡¾Ð¡Ìâ1¡¿ÀûÓÃÌ«Ñô¸ß¶È½Ç¼ÆËã¼°Èý½Çº¯Êý¹«Ê½¼ÆËãÂ¥¸ß¡¢Â¥¾à¡££¨1£©¾ÝͼÖиø³öµÄÄÏ¥¥¸ß¡¢Äϱ±Â¥Â¥¾àÖ®±ÈΪ 1.725£¬¿ÉÍƶϸóÇÊÐÕýÎçÌ«Ñô¸ß¶È½Ç±ØÐëµÈÓÚ»ò´óÓÚ 60¡ãʱ£¨tg60¡ã¡Ö1.732£©£¬±±Â¥µÄһ¥²ÅÄÜÈ«ÄêÕýÎçʱɹµ½Ì«Ñô¡£¸Ã³ÇλÓÚ 30¡ãN£¬µ±Ì«ÑôÖ±ÉäÄÏ°ëÇòʱ£¬¸Ã³ÇÊÐÕýÎçÌ«Ñô¸ß¶È¾ùСÓÚ 60¡ã£¬¼´´ÓÇï·ÖÖÁ´ÎÄê´º·Ö¹²¼Æ 6 ¸öÔ£¬¹ÊÑ¡Ïî C ÕýÈ·¡£
¡¾Ð¡Ìâ2¡¿£¨2£©ÒÔÈ«ÄêÕýÎçÌ«Ñô¸ß¶È×îµÍʱ£¨12Ô 22ÈÕ£©£¬¼ÙÉèÁ½Â¥¾à²»±ä£¬ÇóÄÏÂ¥²»µ²×¡±±Â¥Ê±×î´ó¸ß¶È¡£¾Ý¹«Ê½ÇóµÃ 30¡ãN ¶¬ÖÁÈÕʱÕýÎçÌ«Ñô¸ß¶È½ÇΪ 36.5¡ã£¬¼´ÄÏÂ¥¸ßÓ뱱¥¾àÖ®±È±ØÐë´óÓÚ 0.7£¨tg35¡ã¡Ö0.7£©ÓÉ´Ë¿ÉÅųý C¡¢D Ï¶ø A ÏîΪ 20Ã×£¬´Ó¾¼ÃЧÒæ¿´²»Èç 30Ã׺ÏÊÊ£¬¹Ê B Ñ¡ÏîÕýÈ·¡£ÕýÎçÌ«Ñô¸ß¶È½ÇµÄ¼ÆË㣬¼°ÀûÓÃÈý½Çº¯Êý¹«Ê½ÇóÂ¥¸ß»òÂ¥¾à¡£
![](http://thumb2018.1010pic.com/images/loading.gif)