6£®Ä³Ëâ̦Éú²ú»ùµØÊÕ»ñËâ̦200¶Ö£®¼Æ»®²ÉÓÃÅú·¢¡¢ÁãÊÛ¡¢Àä¿â´¢²ØºóÏúÊÛÈýÖÖ·½Ê½³öÊÛ£¬¼Æ»®Æ½¾ùÿ¶ÖµÄÊÛ¼Û¼°³É±¾Èç±í£º
ÏúÊÛ·½Ê½Åú·¢ÁãÊÛ´¢²ØºóÏúÊÛ
ÊÛ¼Û£¨Ôª/¶Ö£©300045005500
³É±¾£¨Ôª/¶Ö£©70010001200
¾­¹ýÒ»¶Îʱ¼ä£¬Ëâ̦°´¼Æ»®È«²¿ÊÛ³ö»ñµÃµÄ×ÜÀûÈóΪy£¨Ôª£©£¬Ëâ̦ÁãÊÛx£¨¶Ö£©£¬ÇÒÁãÊÛÁ¿ÊÇÅú·¢Á¿µÄ$\frac{1}{3}$£®
£¨l£©ÇóyÓëxÖ®¼äµÄº¯Êý¹ØÏµÊ½£»
£¨2£©ÓÉÓÚÊÜÌõ¼þÏÞÖÆ£¬¾­Àä¿â´¢²ØÊÛ³öµÄËâ̦×î¶à80¶Ö£¬Çó¸ÃÉú²ú»ùµØÈ«²¿ÊÛÍêËâ̦»ñµÃµÄ×î´óÀûÈó£®

·ÖÎö £¨1£©ÀûÈó=Åú·¢ÊýÁ¿¡Á£¨Åú·¢ÊÛ¼Û-Åú·¢³É±¾£©+ÁãÊÛÊýÁ¿¡Á£¨ÁãÊÛÊÛ¼Û-ÁãÊ۳ɱ¾£©+´¢²ØÊýÁ¿¡Á£¨´¢²ØÊÛ¼Û-´¢²Ø³É±¾£©£»
£¨2£©Óɿⴢ²ØµÄËâÞ·×î¶à80¶Ö£¬ÔòµÃ200-4x¡Ü80£®ÔÙÓÉyÓëxÖ®¼äµÄº¯Êý¹ØÏµÊ½¿ÉÇóµÃyµÄ×î´óÖµ£®

½â´ð ½â£º£¨1£©ÓÉÌâÒ⣬Åú·¢ËâÞ·3x¶Ö£¬´¢²ØºóÏúÊÛ£¨200-4x£©¶Ö£¬
Ôòy=3x£¨3000-700£©+x£¨4500-1000£©+£¨200-4x£©£¨5500-1200£©£¬
=-6800x+860000£¨0£¼x¡Ü50£©£®
£¨2£©ÓÉÌâÒâµÃ200-4x¡Ü80£¬
½âµÃ£ºx¡Ý30£¬
¡ßy=-6800x+860000ÇÒ-6800£¼0£¬
¡àyµÄÖµËæxµÄÖµÔö´ó¶ø¼õС£¬
µ±x=30ʱ£¬y×î´óÖµ=-6800¡Á30+860000=656000£¨Ôª£©£»
´ð£º¸ÃÉú²ú»ùµØ°´¼Æ»®È«²¿ÊÛÍêËâÞ·»ñµÃµÄ×î´óÀûÈóΪ656000Ôª£®

µãÆÀ ±¾ÌâÖ÷Òª¿¼²éÁËÒ»´Îº¯ÊýÔÚʵ¼ÊÎÊÌâÖеÄÓ¦Ó㬽â´ðÒ»´Îº¯ÊýµÄÓ¦ÓÃÎÊÌâÖУ¬Òª×¢Òâ×Ô±äÁ¿µÄȡֵ·¶Î§»¹±ØÐëʹʵ¼ÊÎÊÌâÓÐÒâÒ壮

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

16£®½â·½³Ì£º3£¨x-1£©2-6=0£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

17£®Ð¡Ã÷Éí¸ß165cm£¬ÒÔСÃ÷Éí¸ßΪ±ê×¼£¬Ð¡Ã÷°Ö°ÖÉí¸ß175cm£¬¼Ç×÷+10cm£¬Ð¡Ã÷ÂèÂèÉí¸ß163cm£¬Ó¦¼Ç×÷£¨¡¡¡¡£©
A£®2cmB£®12cmC£®-2cmD£®-12cm

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

14£®ÒÑÖª£ºÔÚ¡÷ABCÖУ¬AB=AC£®
£¨1£©³ß¹æ×÷ͼ£º×÷AD¡ÍBCÓÚµãD£®£¨²»ÒªÇóд×÷·¨£¬±£Áô×÷ͼºÛ¼££©
£¨2£©ÑÓ³¤ADÖÁEµã£¬Ê¹µÃDE=AD£®ÇóÖ¤£ºËıßÐÎABECÊÇÁâÐΣ®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

1£®²»µÈʽ×é$\left\{\begin{array}{l}{-a¡Ý-6}\\{\frac{13+2a}{3}£¾5}\end{array}\right.$µÄ½â¼¯ÊÇ1£¼a¡Ü6£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

11£®ÔÚ·îÏÍ´´½¨ÎÄÃ÷³ÇÇøµÄ»î¶¯ÖУ¬ÓÐÁ½¶Î³¤¶ÈÏàµÈµÄ²ÊÉ«µÀשÆÌÉèÈÎÎñ£¬·Ö±ð½»¸ø¼×¡¢ÒÒÁ½¸öÊ©¹¤¶Óͬʱ½øÐÐÊ©¹¤£®ÈçͼÊÇ·´Ó³ËùÆÌÉè²ÊÉ«µÀשµÄ³¤¶Èy£¨Ã×£©ÓëÊ©¹¤Ê±¼äx£¨Ê±£©Ö®¼ä¹ØÏµµÄ²¿·ÖͼÏó£®Èç¹û¼×¶ÓÊ©¹¤ËٶȲ»±ä£¬ÒÒ¶ÓÔÚ¿ªÍÚ6Сʱºó£¬Ê©¹¤ËÙ¶ÈÔö¼Óµ½12Ã×/ʱ£¬½á¹ûÁ½¶ÓͬʱÍê³ÉÁËÈÎÎñ£®Çó¼×¶Ó´Ó¿ªÊ¼Ê©¹¤µ½Í깤ËùÆÌÉèµÄ²ÊÉ«µÀשµÄ³¤¶ÈΪ110Ã×£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

18£®ÔÚ·´±ÈÀýº¯Êýy=$\frac{1-2m}{x}$µÄͼÏóÉÏÓÐÁ½µãA£¨x1£¬y1£©£¨x2£¬y2£©£¬µ±x2£¾x1£¾0ʱ£¬ÓÐy2£¾y1£¬ÔòmµÄȡֵ·¶Î§ÊÇ£¨¡¡¡¡£©
A£®m£¼0B£®m£¾0C£®m£¼$\frac{1}{2}$D£®m£¾$\frac{1}{2}$

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

15£®µã£¨x1£¬y1£©£¬£¨x2£¬y2£©ÔÚ·´±ÈÀýº¯Êýy=$\frac{k}{x}$µÄͼÏóÉÏ£¬µ±x1£¼x2£¼0ʱ£¬y1£¼y2£¬ÔòkµÄȡֵ¿ÉÒÔÊÇ-1£®£¨Ö»ÌîÒ»¸ö·ûºÏÌõ¼þµÄkµÄÖµ£©£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

16£®Èçͼ£¬ÔÚÄϱ±·½ÏòµÄº£°¶ÏßMNÉÏ£¬ÓÐA¡¢BÁ½ËÒѲ´¬£¬ÏÖ¾ùÊÕµ½¹ÊÕÏ´¬CµÄÇó¾ÈÐźţ®ÒÑÖªA£®BÁ½´¬Ïà¾à100£¨$\sqrt{3}$+1£©º£À´¬CÔÚ´¬AµÄ±±Æ«¶«60¡ã·½ÏòÉÏ£¬´¬CÔÚ´¬BµÄ¶«ÄÏ·½ÏòÉÏ£¬MNÉÏÓÐÒ»¹Û²âµãD£¬²âµÃ´¬CÕýºÃÔÚ¹Û²âµãDµÄÄÏÆ«¶«75¡ã·½ÏòÉÏ£®ÒÑÖª¾à¹Û²âµãD´¦100º£ÀﷶΧÄÚÓаµ½¸£¬ÈôѲÂß´¬AÑØÖ±ÏßACÈ¥Óª¾È´¬C£¬ÔÚÈ¥Óª¾ÈµÄ;ÖÐÓÐÎÞ´¥°µ½¸Î£ÏÕ£¿£¨²Î¿¼Êý¾Ý£º$\sqrt{2}$¡Ö1.41£¬$\sqrt{3}$¡Ö1.73£©

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸