ÌâÄ¿ÄÚÈÝ
18£®ÎªÁËÈÃѧÉúÁ˽⻷±£ÖªÊ¶£¬ÔöÇ¿»·±£Òâʶ£¬Ä³ÖÐѧ¾ÙÐÐÁËÒ»´Î»·±£ÖªÊ¶¾ºÈü£¬¹²ÓÐ900ÃûѧÉú²Î¼ÓÁËÕâ´Î¾ºÈü£®ÎªÁ˽Ȿ´Î¾ºÈü³É¼¨Çé¿ö£¬´ÓÖгéÈ¡Á˲¿·ÖѧÉúµÄ³É¼¨½øÐÐͳ¼Æ£®ÇëÄã¸ù¾ÝÉÐδÍê³É²¢Óоֲ¿ÎÛËðµÄƵÂÊ·Ö²¼±íºÍƵÂÊ·Ö²¼Ö±·½Í¼£¬½â´ðÏÂÁÐÎÊÌ⣺·Ö×é | ƵÊý |
50.5¡«60.5 | 4 |
60.5¡«70.5 | 8 |
70.5¡«80.5 | 10 |
80.5¡«90.5 | 16 |
90.5¡«100.5 | 12 |
ºÏ¼Æ | 50 |
£¨2£©²¹È«ÆµÊýÖ±·½Í¼£»
£¨3£©È«Ìå²ÎÈüѧÉúÖУ¬¾ºÈü³É¼¨ÂäÔÚÄÄ×鷶ΧÄÚµÄÈËÊý×î¶à£¿80.5¡«90.5
£¨4£©Èô³É¼¨ÔÚ90·ÖÒÔÉÏ£¨²»º¬90·Ö£©ÎªÓÅÐ㣬Ôò¸ÃУ³É¼¨ÓÅÐãµÄԼΪ¶àÉÙÈË£¿
·ÖÎö £¨1£©Ïȸù¾ÝµÚÒ»×éµÄƵÊýÓë³éÈ¡µÄѧÉú×ÜÊýÇó³öµÚÒ»×éƵÂÊ£¬Í¬ÀíÇó³öµÚ¶þ¡¢Èý¡¢ËÄ×éµÄƵÂÊ£¬ÓÃ50¼õȥǰËÄ×éµÄÈËÊý¼´¿ÉµÃµ½µÚÎå×éµÄƵÊý£¬¸ù¾ÝƵÂʵĺ͵ÈÓÚ1¼´¿ÉÇó³öµÚÎå×éµÄƵÂÊ£»
£¨2£©¸ù¾ÝƵÂÊ·Ö²¼±í²¹È«Ö±·½Í¼£»
£¨3£©¸ù¾ÝƵÂʵÄÒâÒ壬ѡÔñƵÂÊ×î´óµÄÒ»×飻
£¨4£©ÓÃ×ÜÈËÊý³ËÒÔÓÅÐãÂÊ£¬½øÐмÆËã¼´¿ÉµÃ½â£®
½â´ð ½â£º£¨1£©¸ù¾Ýͼ±íÐÅÏ¢£¬µÚÒ»×éµÄƵÊýΪ4£¬³éÈ¡µÄѧÉúÊýΪ50£¬ÔòµÚÒ»×éƵÂÊΪ4¡Â50=0.08£¬
µÚ¶þ×éµÄƵÂÊÊÇ8¡Â50=0.16£¬µÚÈý×éµÄƵÂÊÊÇ10¡Â50=0.20£¬µÚËÄ×éµÄƵÂÊÊÇ16¡Â50=0.32£¬
µÚÎå×éµÄƵÊýÊÇ50-4-8-10-16=50-38=12£¬µÚÎå×éµÄƵÂÊÊÇ1-0.08-0.16-0.20-0.32=1-0.76=0.24£¬
ƵÂÊ·Ö²¼±íÈçͼ£®
¹Ê´ð°¸Îª12£»
£¨2£©ÆµÊýÖ±·½Í¼Èçͼ£»
£¨3£©È«Ìå²ÎÈüѧÉúÖУ¬¾ºÈü³É¼¨ÂäÔÚ80.5¡«90.5ÕâÒ»×鷶ΧÄÚµÄÈËÊý×î¶à£®
¹Ê´ð°¸Îª80.5¡«90.5£»
£¨4£©900¡Á0.24=216£®
µãÆÀ ±¾Ì⿼²é¶ÁƵÊý·Ö²¼Ö±·½Í¼µÄÄÜÁ¦ºÍÀûÓÃͳ¼Æͼ»ñÈ¡ÐÅÏ¢µÄÄÜÁ¦£®ÀûÓÃͳ¼Æͼ»ñÈ¡ÐÅϢʱ£¬±ØÐëÈÏÕæ¹Û²ì¡¢·ÖÎö¡¢Ñо¿Í³¼Æͼ£¬²ÅÄÜ×÷³öÕýÈ·µÄÅжϺͽâ¾öÎÊÌ⣮
A£® | -8»ò1 | B£® | 8 | C£® | -8»ò2 | D£® | 2 |
A£® | ×î´óµÄ¸ºÓÐÀíÊýÊÇ-1 | |
B£® | ÈκÎÓÐÀíÊýµÄ¾ø¶ÔÖµ¶¼ÊÇÕýÊý | |
C£® | 0ÊÇ×îСµÄÊý | |
D£® | Èç¹ûÁ½¸öÊý»¥ÎªÏà·´Êý£¬ÄÇôËüÃǵľø¶ÔÖµÏàµÈ |
A£® | m£¾1 | B£® | m¡Ü1 | C£® | m£¼1ÇÒ m¡Ù0 | D£® | m¡Ü1ÇÒ m¡Ù0 |