22£®½â£º(1)¸ù¾ÝÌâÒ⣬µÃ160x£«(190£160)(x£«0.15)£½90£¬½âµÃx£½0.45.Ôò³¬³ö²¿·ÖµÄµç·Ñµ¥¼ÛÊÇx£«0.15£½0.6(Ôª/ǧÍßʱ)£®(5·Ö)
´ð£ºxºÍ³¬³ö²¿·Öµç·Ñµ¥¼Û·Ö±ðÊÇ0.45Ôª/ǧÍßʱºÍ0.6Ôª/ǧÍßʱ£®(6·Ö) (2)Éè¸Ã»§¾ÓÃñÁùÔ·ݵÄÓõçÁ¿ÊÇaǧÍßʱ£¬ÒòΪ160¡Á0.45£½72(Ôª)£¬ËùÒԸû§¾ÓÃñÁùÔ·ÝÓõçÁ¿³¬¹ý160ǧÍßʱ£¬Ôò75¡Ü160¡Á0.45£«0.6(a£160)¡Ü84£¬½âµÃ165¡Üa¡Ü180.(11·Ö)
´ð£º¸Ã»§¾ÓÃñÁùÔ·ݵÄÓõçÁ¿ÔÚ165ǧÍßʱµ½180ǧÍßʱ֮¼ä£®(12·Ö)
23
23£®½â£º(1)Éè×âAÐͳµxÁ¾£¬Ôò×âBÐͳµ(5£x)Á¾£¬¸ù¾ÝÌâÒâµÃ200x£«150(5£x)¡Ü980£¬½âµÃx¡Ü.(4
5·Ö)ÒòΪxÈ¡·Ç¸ºÕûÊý£¬ËùÒÔx£½0£¬1£¬2£¬3£¬4£¬ËùÒÔ¸ÃѧУµÄ×â³µ·½°¸ÓÐÈçÏÂ5ÖÖ£º×âAÐͳµ0Á¾¡¢BÐͳµ5Á¾£»×âAÐͳµ1Á¾¡¢BÐͳµ4Á¾£»×âAÐͳµ2Á¾¡¢BÐͳµ3Á¾£»×âAÐͳµ3Á¾¡¢BÐͳµ2Á¾£»×âAÐͳµ4Á¾¡¢BÐͳµ1Á¾£®(7·Ö)
523
(2)¸ù¾ÝÌâÒâµÃ40x£«20(5£x)¡Ý150£¬½âµÃx¡Ý.(10·Ö)ÒòΪxÈ¡ÕûÊý£¬ÇÒx¡Ü£¬ËùÒÔx£½3»ò4.µ±x£½
253ʱ£¬×â³µ·ÑÓÃΪ200¡Á3£«150¡Á2£½900(Ôª)£»µ±x£½4ʱ£¬×â³µ·ÑÓÃΪ200¡Á4£«150¡Á1£½950(Ôª)£®ÒòΪ900
£¼950£¬ËùÒÔµ±×âAÐͳµ3Á¾¡¢BÐͳµ2Á¾Ê±£¬×â³µ·ÑÓÃ×îµÍ£®(14·Ö)
µÚ8Õ Õûʽ³Ë·¨ÓëÒòʽ·Ö½â
Ò»¡¢Ñ¡ÔñÌâ(±¾´óÌâ¹²10СÌ⣬ÿСÌâ4·Ö£¬Âú·Ö40·Ö) 1£®ÏÂÁÐÔËËãÖУ¬½á¹ûÊÇa6µÄʽ×ÓÊÇ( ) A£®a2¡¤a3 B£®a12£a6 C£®(a3)3 D£®(£a)6
2£®¼ÆËã(£xy3)2µÄ½á¹ûÊÇ( ) A£®x2y6 B£®£x2y6 C£®x2y9 D£®£x2y9 3£®¿ÆÑ§¼ÒʹÓÃÌúÄÉÃ׿ÅÁ£ÒÔ¼°¾ßÓдÅÐÔµÄîܺÍ̼ÄÉÃ׿ÅÁ£ºÏ³ÉÁËÖ±¾¶Ô¼Îª0.000000012Ã×µÄÐÂÐͲÄÁÏ£¬ÕâÖÖ²ÄÁÏÄÜÔÚ¸ßÎÂÏ´¢´æÐÅÏ¢£¬¾ßÓйãÀ«µÄÓ¦ÓÃǰ¾°£®ÕâÀïµÄ¡°0.000000012Ãס±ÓÿÆÑ§¼ÇÊý·¨±íʾΪ( )
££
A£®0.12¡Á107Ã× B£®1.2¡Á107Ã×
££
C£®1.2¡Á108Ã× D£®1.2¡Á109Ã× 4£®¶ÔÓÚ¶àÏîʽ£º¢Ùx2£y2£»¢Ú£x2£y2£»¢Û4x2£y£»¢Üx2£4£¬Äܹ»ÓÃÆ½·½²î¹«Ê½½øÐÐÒòʽ·Ö½âµÄÊÇ( ) A£®¢ÙºÍ¢Ú B£®¢ÙºÍ¢Û C£®¢ÙºÍ¢Ü D£®¢ÚºÍ¢Ü
5£®ÏÂÁи÷ʽµÄ¼ÆËãÖÐÕýÈ·µÄ¸öÊýÊÇ( )
££
¢Ù100¡Â101£½10; ¢Ú104¡¤(2¡Á7)0£½1000£»
11
£?£½8; ¢Ü(£10)£4¡Â?£?£½£1. ¢Û(0.1)0¡Â??2??10?A£®4¸ö B£®3¸ö
C£®2¸ö D£®1¸ö
£
6£®Èô2x£½3£¬8y£½6£¬Ôò2x3yµÄֵΪ( ) 1
A. B£®£2 2C.63 D. 22£3
£4
7£®ÏÂÁмÆËãÕýÈ·µÄÊÇ( ) A£®£3x2y¡¤5x2y£½2x2y B£®£2x2y3¡¤2x3y£½£2x5y4 C£®35x3y2¡Â5x2y£½7xy
D£®(£2x£y)(2x£«y)£½4x2£y2 8£®ÏÂÁÐÒòʽ·Ö½âÕýÈ·µÄÊÇ( ) A£®a4b£6a3b£«9a2b£½a2b(a2£6a£«9) B£®x2£x£«
1?1?2£½x£ 4?2?C£®x2£2x£«4£½(x£2)2
D£®4x2£y2£½(4x£«y)(4x£y)
9£®ÒÑÖªab2£½£1£¬Ôò£ab(a2b5£ab3£b)µÄÖµµÈÓÚ( )
A£®£1 B£®0
C£®1 D£®ÎÞ·¨È·¶¨
10£®Ô½Ô½ÊÇһλÃÜÂë±àÒë°®ºÃÕߣ¬ÔÚËûµÄÃÜÂëÊÖ²áÖУ¬ÓÐÕâÑùÒ»ÌõÐÅÏ¢£ºa£b£¬x£y£¬x£«y£¬a£«b£¬x2£y2£¬a2£b2·Ö±ð¶ÔÓ¦³Ç¡¢°®¡¢ÎÒ¡¢ÃÉ¡¢ÓΡ¢ÃÀÕâÁù¸öºº×Ö£¬ÏÖ½«(x2£y2)a2£(x2£y2)b2Òòʽ·Ö½â£¬½á¹û³ÊÏÖµÄÃÜÂëÐÅÏ¢¿ÉÄÜÊÇ( )
A£®ÎÒ°®ÃÀ B£®ÃɳÇÓÎ
C£®°®ÎÒÃÉ³Ç D£®ÃÀÎÒÃɳÇ
¶þ¡¢Ìî¿ÕÌâ(±¾´óÌâ¹²4СÌ⣬ÿСÌâ5·Ö£¬Âú·Ö20·Ö) 11£®¼ÆË㣺(12a3£6a2)¡Â(£2a)£½__________£®
12£®Èô´úÊýʽx2£6x£«b¿É»¯Îª(x£a)2£1£¬Ôòb£aµÄÖµÊÇ________£® 13£®Èôa£b£½1£¬Ôò´úÊýʽa2£b2£2bµÄֵΪ________£®
14£®a£¬bÊÇʵÊý£¬¶¨ÒåÒ»ÖÖÔËËã@ÈçÏ£ºa@b£½(a£«b)2£(a£b)2.ÓÐÏÂÁнáÂÛ£º¢Ùa@b£½4ab£»¢Úa@b£½b@a£»¢ÛÈôa@b£½0£¬Ôòa£½0ÇÒb£½0£»¢Üa@(b£«c)£½a@b£«a@c.ÆäÖÐÕýÈ·µÄ½áÂÛÊÇ________(ÌîÐòºÅ)£®
Èý¡¢(±¾´óÌâ¹²2СÌ⣬ÿСÌâ8·Ö£¬Âú·Ö16·Ö) 15£®¼ÆË㣺
(1)(a2)3¡¤(a3)2¡Â(a2)5£»
(2)(a£b£«c)(a£«b£c)£®
16£®Òòʽ·Ö½â£º
(1)3x4£48; (2)(c2£a2£b2)2£4a2b2.
ËÄ¡¢(±¾´óÌâ¹²2СÌ⣬ÿСÌâ8·Ö£¬Âú·Ö16·Ö)
17£®ÏÈ»¯¼ò£¬ÔÙÇóÖµ£º(x2£«3x)(x£3)£x(x£2)2£«(x£y)(y£x)£¬ÆäÖÐx£½3£¬y£½£2.
11
18£®ÒÑÖªa£«b£½2£¬ab£½2£¬Çóa3b£«a2b2£«ab3µÄÖµ£®
22
Îå¡¢(±¾´óÌâ¹²2СÌ⣬ÿСÌâ10·Ö£¬Âú·Ö20·Ö) 19£®ÕÅÀÏʦ¸øÍ¬Ñ§ÃdzöÁËÒ»µÀÌ⣺µ±x£½2018£¬y£½2017ʱ£¬Çó[(2x3y£2x2y2)£«xy(2xy£x2)]¡Âx2yµÄÖµ£®ÌâÄ¿³öÍêºó£¬Ð¡Ã÷˵£º¡°ÀÏʦ¸øµÄÌõ¼þy£½2017ÊǶàÓàµÄ£®¡±Ð¡±øËµ£º¡°²»¶àÓ࣬²»¸øÕâ¸öÌõ¼þ£¬¾Í²»ÄÜÇó³ö½á¹û£®¡±ÄãÈÏΪËûÃÇË˵µÃÓеÀÀí£¿²¢ËµÃ÷ÄãµÄÀíÓÉ£®
20£®ÒÑÖª¶àÏîʽx2£«nx£«3Óë¶àÏîʽx2£3x£«mµÄ³Ë»ýÖв»º¬x2ºÍx3ÏÇóm£¬nµÄÖµ£®
Áù¡¢(±¾ÌâÂú·Ö12·Ö)