2£®¼ÆËãÌâ
£¨1£©£¨-8$\frac{3}{7}$£©+£¨-7.5£©+£¨-21$\frac{4}{7}$£©+£¨+3$\frac{1}{2}$£©
£¨2£©£¨-81£©¡Â$\frac{9}{4}$¡Á$\frac{4}{9}$¡Â£¨-16£©
£¨3£©£¨-24£©¡Á£¨$\frac{1}{3}$-$\frac{1}{8}$-$\frac{1}{6}$£©
£¨4£©-12+[-4+£¨1-0.2¡Á$\frac{1}{5}$£©]¡Â£¨-2£©2
£¨5£©-|-$\frac{2}{3}$|-|-$\frac{1}{2}$¡Á$\frac{2}{3}$|-|$\frac{1}{3}$-$\frac{1}{4}$|-|-3|
£¨6£©-22+£¨-0.5£©2¡Â£¨-1$\frac{1}{4}$£©-£¨-2£©2¡Á£¨-$\frac{1}{4}$£©
£¨7£©£¨-1£©2003+£¨-32£©¡Á|-$\frac{2}{9}$|-42¡Â£¨-2£©2£®

·ÖÎö £¨1£©¸ù¾ÝÓÐÀíÊýµÄ¼Ó·¨ºÍ¼õ·¨¿ÉÒÔ½â´ð±¾Ì⣻
£¨2£©¸ù¾ÝÓÐÀíÊýµÄ³ý·¨ºÍ³Ë·¨¿ÉÒÔ½â´ð±¾Ì⣻
£¨3£©¸ù¾Ý³Ë·¨·ÖÅäÂÉ¿ÉÒÔ½â´ð±¾Ì⣻
£¨4£©¸ù¾ÝÃݵij˷½ºÍÓÐÀíÊýµÄ³Ë³ý·¨ºÍ¼Ó¼õ·¨¿ÉÒÔ½â´ð±¾Ì⣻
£¨5£©ÏÈÈ¥µô¾ø¶ÔÖµ·ûºÅ£¬ÔÙ¸ù¾ÝÓÐÀíÊýµÄ¼õ·¨¿ÉÒÔ½â´ð±¾Ì⣻
£¨6£©¸ù¾ÝÃݵij˷½ºÍÓÐÀíÊýµÄ³Ë³ý·¨ºÍ¼Ó¼õ·¨¿ÉÒÔ½â´ð±¾Ì⣻
£¨7£©¸ù¾ÝÃݵij˷½ºÍÓÐÀíÊýµÄ³Ë³ý·¨ºÍ¼Ó¼õ·¨¿ÉÒÔ½â´ð±¾Ì⣮

½â´ð ½â£º£¨1£©£¨-8$\frac{3}{7}$£©+£¨-7.5£©+£¨-21$\frac{4}{7}$£©+£¨+3$\frac{1}{2}$£©
=[£¨-8$\frac{3}{7}$£©+£¨-21$\frac{4}{7}$£©]+[£¨-7.5£©+3.5]
=£¨-30£©+£¨-4£©
=-34£»
£¨2£©£¨-81£©¡Â$\frac{9}{4}$¡Á$\frac{4}{9}$¡Â£¨-16£©
=$81¡Á\frac{4}{9}¡Á\frac{4}{9}¡Á\frac{1}{16}$
=1£»
£¨3£©£¨-24£©¡Á£¨$\frac{1}{3}$-$\frac{1}{8}$-$\frac{1}{6}$£©
=$£¨-24£©¡Á\frac{1}{3}-£¨-24£©¡Á\frac{1}{8}-£¨-24£©¡Á\frac{1}{6}$
=£¨-8£©+3+4
=-1£»
£¨4£©-12+[-4+£¨1-0.2¡Á$\frac{1}{5}$£©]¡Â£¨-2£©2
=-1+[-4+£¨1-$\frac{1}{25}$£©]¡Â4
=-1+[-4+$\frac{24}{25}$]¡Á$\frac{1}{4}$
=-1-1+$\frac{6}{25}$
=-1$\frac{19}{25}$£»
£¨5£©-|-$\frac{2}{3}$|-|-$\frac{1}{2}$¡Á$\frac{2}{3}$|-|$\frac{1}{3}$-$\frac{1}{4}$|-|-3|
=$-\frac{2}{3}-\frac{1}{3}-\frac{1}{12}-3$
=$-4\frac{1}{12}$£»
£¨6£©-22+£¨-0.5£©2¡Â£¨-1$\frac{1}{4}$£©-£¨-2£©2¡Á£¨-$\frac{1}{4}$£©
=-4+$\frac{1}{4}$¡Á$£¨-\frac{4}{5}£©$-4¡Á$£¨-\frac{1}{4}£©$
=-4-$\frac{1}{5}$+1
=$-3\frac{1}{5}$£»
£¨7£©£¨-1£©2003+£¨-32£©¡Á|-$\frac{2}{9}$|-42¡Â£¨-2£©2
=£¨-1£©+9¡Á$\frac{2}{9}$-16¡Â4
=£¨-1£©+2-4
=-3£®

µãÆÀ ±¾Ì⿼²éÓÐÀíÊýµÄ»ìºÏÔËË㣬½âÌâµÄ¹Ø¼üÊÇÃ÷È·ÓÐÀíÊý»ìºÏÔËËãµÄ¼ÆËã·½·¨£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

12£®Ä³É̵꾭ӪһÖÖСÉÌÆ·£¬½ø¼ÛÊÇ2.5Ôª£¬¾ÝÊг¡µ÷²é£¬ÏúÊÛ¼ÛÊÇ13.5Ԫʱ£¬Æ½¾ùÿÌìÏúÊÛÊÇ500¼þ£¬¶øÏúÊÛ¼Ûÿ½µµÍ1Ôª£¬Æ½¾ùÿÌì¾Í¿ÉÒÔ¶àÊÛ³ö100¼þ£®
£¨I£©¼Ù¶¨Ã¿¼þÉÌÆ·½µ¼ÛxÔª£¬É̵êÿÌìÏúÊÛÕâÖÖСÉÌÆ·µÄÀûÈóÊÇ yÔª£¬Çëд³öyÓëx¼äµÄº¯Êý¹ØÏµÊ½£»
£¨II£©Ã¿¼þСÉÌÆ·ÏúÊÛ¼ÛÊǶàÉÙԪʱ£¬É̵êÿÌìÏúÊÛÕâÖÖСÉÌÆ·µÄÀûÈó×î´ó£¿×î´óÀûÈóÊǶàÉÙ£¿

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

13£®£¨1£©¼ÆË㣺£¨$\sqrt{3}$+$\sqrt{2}$£©-$\sqrt{2}$
£¨2£©2x2=8£¬ÇóxµÄÖµ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

10£®½â·½³Ì£º
£¨1£©2x+2=3x-1
£¨2£©1-$\frac{1}{2}$x=3-$\frac{1}{6}$x£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

17£®ÒÑÖª£ºa£¬b£¬cÔÚÊýÖáÉϵĶÔÓ¦µãÈçͼËùʾ£º

£¨1£©±È½Ï´óС£ºa+b£¼0£¬|c|£¼|b|£»
£¨2£©»¯¼ò£º|a-b|-|a+b|-|c-a|+|b+c|

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

7£®ÒÑÖªÈý¸ö»¥²»ÏàµÈµÄÕýÕûÊýµÄƽ¾ùÊý¡¢ÖÐλÊý¶¼ÊÇ3£¬ÔòÕâÈý¸öÊýµÄ·½²îÊÇ$\frac{2}{3}$»ò$\frac{8}{3}$£®£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

14£®Èôxn=-3£¬Ôòx2n=9£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

11£®Èçͼ£¬ÔÚRt¡÷ABC ÖУ¬AB=AC£¬D¡¢EÊÇб±ßBCÉÏÁ½µã£¬ÇÒ¡ÏDAE=45¡ã£¬½«¡÷ADCÈÆµãA˳ʱÕëÐýת90¡ãºó£¬µÃµ½¡÷AFB£¬Á¬½ÓEF£®ÏÂÁнáÂÛÖÐÕýÈ·µÄÓТ٢ڢۣ®£¨Ç뽫ÕýÈ·´ð°¸µÄÐòºÅÌîÔÚºáÏßÉÏ£©
¢Ù¡ÏEAF=45¡ã   
¢ÚEAƽ·Ö¡ÏCEF  
¢ÛBE2+DC2=DE2   
¢ÜBE=DC£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

6£®Èçͼ£¬ABÊÇÔ²OµÄÖ±¾¶£¬¡ÏABC=30¡ã£¬OA=2£¬ÔòACµÄ³¤Îª£¨¡¡¡¡£©
A£®2B£®4C£®2$\sqrt{3}$D£®$\sqrt{3}$

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸