1、?mingliu ?i ?siititintt ?0i0?tnt31 ?tgnu ?tin -1 ?s isttg“1”?tit ?l25%?tn b ?tmmtna1. ? ?0?l itt ?si ?sist ?s ? 2.?0mgt tgs02 ? is? ?m ?t0mt ?1s2012?tgnu ?tin2- 360?0?l ?0mnit?itt ?s0? ?mgt ?tgs? ?sm0? mnit? tgs ?t0mt 1s ?itt ?t? ?tgntt ?0mgt sm?s ?smtigit65360 （人）（人） 300 ?0?l itt300? :?0mnit tgs ?6

2、53?0i0 ?ns it 16+16 =16+4 =20（人）（人）41?0i0 ?ns ? 16（1+ ） =16 =20（人）（人）4145 ? ?0?l itt ?t?: 20?tgnu ?tin -3 41 ?mingli ?nn? ming灄珘g iin? 16 灄6 ?m?珘 灄in灄耀 ?i灄il? mi珘 n ?m?珘 灄耀43?tnt:?igit smntmt?utg 0041tms ?tg itt ?g?lt12 ?tg? tmmtnl i?t?i ?stmt?utg? tg t0mt tms ?stlt i?tuu?i i ?smitlg?nittin t?i n ?t

3、? isiit.?stt? ?t?nl ?12?tit?st?1 n?t1.?smtn ?ntmgt ?n?t2.?gimil ?t ?i ?t?iguin(i0im ?ti g ?s ?itt)35 ?:i?t stmt?utg 8651tms ?tg itt?0mit ?0i0 ?ns 14001400 12%=1400 168=1568（tms）?0m0? i0 ?ns 1400 （1 12%）=1400 112%=1568（tms）?mi t ?tg? mtn+?tgi ?tg? mtn=?i?t itt ?tg3?tnt:?igit smntmt?utg 0041tms ?tg it

4、t ?g?lt12 ?tg? tmmtnl i?t?i ?stmt?utg? tg t0mt tms ?stlt 6smil?0mnit tgs?0? ? 02 ?l ?itt ?sist i?0l ?10smln?gi ?tgn ? ?si?0l ?mtn ?t0mt ，20 +2010%=20+2=22(1s）?0mit ?0i0 ?ntg?0m0? i0 ?ntg20 （1+10%）=20 110%=22（1s）? i?0l+? ?si?0l ?sist ?gi=? ?0?l ?mtn?:? ?0?l ?mtn22 1s?7?igt 1s ?mtn-?t ?t? 1s ?mtn=?t 1

5、s ?mtn?l ? ?i?m ?nm ?n?g?耀 6in耀?g? 灄ngn耀2800 ?m?珘 灄耀 ?ng珘耀.?n?耀 ?0.5?m?珘 r?ii?2?耀 ?n?g?耀 ?g?g? ?m?珘 ?i? ?miiin灄珘 灄珘8?0mit ?0i0 ?ntg?:280028000.5%=2800 14=2786)1s）?0m0? i0 ?ntg?:2800（10.5%）=2800 99.5%=2786（1s）?:?t tg0?tgntt 2786?0?l itt91、tm?0tt?i?lutmgt?tn60 igitl?tmgt?tn t0mt ?igitl?ig20%2、?i?lutmg

6、t?tn 80igitl?tm?0tttmgt?tn t0mt ?igitl?i25%irsmni ?it ?i s ?t? ?stga、6020%b、80-8025%c、6020%d、60+6020%db10?stiit ?ggt?1.1i ?mtt?l ?gii?l ?0ttttn ?l?ttm? ?mi t ?iiti? ?mil 15 ?is igit i?t?g?lt ?tmn?mi t32 ?s?ii.?mtt?l ?i?t ?ms? ?t0mt2.1ttt ?ggl? ?0mit sm?in 1401s itt ?0m ?g?lt ?0m? g?in 1s ?mtn ?0mit ?tg?in ?20smln? ?0m tg?in t0mt 1s ?itt 11?stiit ?ggt? ?t?0 it ?ttt ii?0tuntt 1600?i? ?ntt ? t?stlt ?utt? ?m?ttt40 ? ?nlms ?utt? s?ttt ?m ?t0mt ?i? ?itt121、a=20,b=40t0mt ?gmingliu ?tn ?mmtna2、a=20smln ?tn ?t0mt,?tn ?m ?tit?b2040=50%b=2050%=103、a=20, ?tn ?m ?tit? ?nlms ?tn ?t0mt b?ib=2050%