4.2 实际问题的函数建模（学案一）-2020年高中同步教与学数学（北师大版必修1）

书书书 !"# ! $ % & ' !" ! !"#$%&'() ! # *+ " !! !"#$%&'()*+,-./ ! "012345/6789/ ! :; !!"# $ %& '(槡 ) * " ! <=>?,-./@"017A B " " C + ), 7DE # , $ *+ ! !"#$%&'-. )# FGH *( IJK7LMNO, ) IP;QRH ! SO, ) I TUVWPX;QYH ! Z[\]^_ ! `Oa $ " $ " ) # bO ,JK % " $ # I ! c % " $ # 7defg !!!! # *# hi & $ ' jklm )%( nN ! opqrs=tuv -( nN7 wxy & kze ' k ! + ' k{9|uvPS=tuv %( n N7wx}~ & k ! �rs�q & k7m� ( d��v� ! 7�� ! defg !!!! # /012 ! 345/6789:;&')< # !! !"#$% !! ������ ! ���E�� ! g������7�� # !! &'() !! # = $ $ ! ���x ) " . # �*�qk�7�x (/0 ��� �� ! z2� ))/0 �� ! � t2I )/0 ! ���� -. ! �+ ¡�72���¢£¤¥� " ¦k��x� **. # # § %" ) # ) ¨ ( 7���� & " * # (!'1%/0 =© (!)*/0 ª7�� # >4 ! !" ))/0 #$%!" ))/0 #! ! &'()%* +,-./).012345 ! 67012389:;01 # ?@ ! " ) # <=> ! ( # ( # )) ? ! ) !**2-( ! @#A (!)) ? ! ) !**2-3))!2,, ! BCA ( $ )) ? ! ) !2,,# D! ! @E 01239 ) ! **2-( ! ( % $ ( ! )) % 2,, ! ( % " )) ! 4 5 ' # " * # < " ) # F ! (!'1%/0 G.'(9 ) !**2-3'1%! ). ! (!)*/0 G.'(9 2,,.# # 6ABC $ $ ! o«p¬­ ! ^®h¯°® * ±² *%6# ³ ´µ¶­/�|·® ! =¸¯·®¹: *(6 º»P¼<½¾» ® *%6 7¿: ! cÀ«pÁÂZí/7Ä� ( ¨¯·®¹: ÅÆ ) Ç�7����g !!!! # /01D ! EF'GHI:;&'89 !! !"#$% !! �ÈÉUgÊË�E��ÌÍ,ÎÏ7�#def7|à ÐÑ ! ÒÈÉU��<=¶o�E^_ÓÔ@ÕÖ # �×�ÈÉ UØ�ÙÚÛÜ,�È7ÝÞß ! àP%&áâÝÞãäå; lÛ7��^_ÉU # �æÝÞß¡�ç ! <è�Èéêëì # !! &'() !! # = " $ ! íî )777 ! *((* Aîï5ðÅñ " òó % ôõö # ÷ødù� % Aú )777 *((( *(() *((* ( ( ) * ' 5ðÅñ 81*(-& 817,,* 71%7'' )(1*'78 !! û,��ßü ! ýþÿ!Ç�7���� ! ÎÏk",|# ����f # >4 ! HIJKL ! MN:OLP ! QRISA.TU01 ! VW31XYWZO[ # ?@ ! û,��ß$ # F��ß$<=%, ! û,7ÞÎÏk&+|'()2 ! * <å+),��-.�#�� # ¦ù§),��� % ) !$(4+ � ( ) Á & 7 j Þ " ( ! 8#*(-& # / " ' ! )(1*'78 # B02f ! �Ð12¾ % $!(1-&&& ! +! 81*(-&# 3Àù§����f� % ) !(1-&&&(481*(-& JKLM ! HIJKL ! \]LPQRSA.TU01^ 2_ ! `?abcdefghij # # 6ABC " $ ! 45|267�È÷ø % ! )177 '1( ,1( %1) -1)* , )1% ,1(, &1% )* )81() !! 8�9;ø:��;7|#d�Z<�ÈH=7>? ! @ ;ABÎ7|#g " !! # 9:,!"# $* ! ;:,!"# $ ) * ! +:,! ! * 2) * <:,!*!2* ;����Cû6DØ� ! ��g���E;7�E�� ! å+Fê7���� # ( ) ( !"#$%&' ! '( " ) # *+ , " *+ ! N&')<>O!"#$ )# G?HIJKL�� ! `tM ' AG?H®N