40.7"g2671g74llC9144\r@.\r\r(1)Lx;0J>=140-(L G-10),yOPx0 O}Q,\r(2)E7"8LxF718L(100-x)L 8¡¢"£¤u9200@NRS`.D\r¥¦§s¨!©25ª«40¬F1W100-XV75©40cxe1¬F40V100-x<L\r g0¤®%7"gL0 w ¯°N±.\r\r!(1)Lx(lOVxVl)¬y=140-(x-10)=150-x.\r²yOPx0 O}Q?j=150-x\r(2)E7"8LxF718L(1()()-x).\r©25cxs40¬F1S100-XV75,Fx(150-x)+80(100-x)=9200,\rxi=30,X2=40\r©40cxVI¬F40V100-*Vl,\r³!Jx(150-x)+(100-x)[150-(100-x)]=92()(),\rx=30x=70,µ40VxVI,¶x·,\r!7"8L G*3040.\rE7"gLxF71gL(100-x)E g¤®w@.\r©25<x<40¬w=x(150-x)+80(100-x)=-(x-35)2+9225,\r#x=26¬wlPmlPm*9144@,\r©40VxVI¬\rw=x(150-x)+(100-x)[150-(100-x)]=-2(x-50)2+10000,\r...x=4159¬wlPmlPm*9838@\r¸¹¶º!7"g2671g74llC9144@.\rqr\rstu"@1gRS0vw»¼½?"g O}Q?Oz?¾¿?À0\nÁ?ÀÂN0\r{N?Ã0hGO}NRSÄ`.