资源描述
1?ria ?灄斿i? ?ia灄?斿 ?软仿r? 4-?ii ?软软 2-?a2?搁 ?1.?搁 ? ? ?,?5?%? ? ?,?5 ? 180?5 ?.2. ? ? ? ? ? ?,? ? ?1? ?8 ? ? ?%?%?. 3.?5? ? ? ?1 ? ?搁 ? ?. 3? ?5?i?i斿 1? ? ?1i?i仿软1软 灄1? ?.?1? ?斿a ?斿1 ?r? ?1软i1 ?i 灄1ai软i? ?斿斿?.( (灄1 ?i灄软d? ?i斿41235?d ?ia ?ii斿?a ?r灄i ?1? ? ?软斿ad? ?斿灄1 ?1?r11仿1? ?灄?仿 ?仿? 灄1灄1? i仿11 ? ?ai ?i ? ?1?斿r灄?软i i?斿 ?仿? r灄i?1r11 ?1斿?灄? ?a ?i仿r? r?仿.?1? i?斿 ?仿? r灄i?1r11 ra斿 i仿 ?1斿?灄? ?i斿rd1 ?a ?r?仿 ?斿 ?ai? 斿? ir?斿i rir灄a. 6?1i?1r11仿1? ?ir灄i 灄1 ?仿? r1?r11 ?1斿?灄? ?a?1? i?斿 ?仿? r1?r11 ?a斿11 ?i仿r? ?ai? a?r?1? ?灄ii软? 斿r?17?,?5?% ?% ? ? ?,?5 ? ? ? ?,?搁 ? ?,?5?% ?%? ? ?,?5 ? ? ?5.? ? ? ? ? ?58?,?5?% ?% ? ? ?,?5 ? 180180 ? ?. ?: ?1 ?,?5?% ? ?5 ?i1 ?灄i19iai1a11?1 ?ii?a ?灄d?ia灄?斿 ?斿r灄?软i ?i灄? r1?r11仿1? ?仿? r灄i?1r11 ra斿 i仿 ?1斿?灄? ?i斿r11 ?1斿r?i1 ?i 灄1 i仿 ?a 灄r1a1? ?i灄? ?a? ?1?仿. 10?软软 ?斿i软?a ?ia?灄 ?软软 ?软r? ?软r?. ? ?软? ?ir软? ra灄?i? a? ?a仿1ra300i仿仿i? 斿i ?灄? ? ?灄i? ? 11 ?ia?灄 ?r? 1灄11ir? ?斿灄i r1?r11仿1? ?仿? r灄i?1r11 ra斿 180?1斿?灄? ?i斿r11 ?1 11 ?斿9仿 1? 斿软i? 12 斿 ?斿?.11 1. r?da?斿 ?a斿?斿 ?1?灄1 ri ?i r1r11仿1? ?ii?i斿 ?ii?ir ?i? r?1斿灄i1 灄1 ?aa? ?1r1170?ard1 ?d仿 ?1r11 i仿 ?1斿?灄? 180180-70-70-70-70= = 4040?8?: ? ?软 ? ?斿i软?,?540122. ?斿? r1?r11仿1? 灄i 灄1 r1?r11 ?1斿?灄? ?a ? r灄1.?i软 ri ?i ?r1r11仿1? ?d仿 ?1?1r11 96 ?1斿?灄?r软 ?1? ?灄i ?斿ad?3.?1? ri (1) 灄1 r1?r11仿1? ?1? ?仿? r灄i?1r11 ?1斿?灄? ?a ard1: 80 75 24 ( ) (2) rd仿 r1?r11仿1? ?仿? r灄i?1r11 ?a斿 ?仿? ?斿?1?r11仿1? rd仿 1斿r11. ( )(3) ? ?仿? ?1?r11仿1? ?1灄1斿?灄d 灄1 rd仿 r1r11仿1? ?a 11?ai rd仿 r1?r11仿1? ?仿? r灄i?1r11 ?a斿 360 1斿r11. ( ) ? ?5400 ? ? ?,?5 ?5.13? ?i?灄i ?i1 ?i?灄i ir? ?i?灄i ri?i斿 ?仿? r灄i?1r11 ?a斿 ?rr1r11仿1? ?仿? r灄i?1r11 ?a斿 ?i斿?软i仿 r1r11仿1? 灄1? ?i?灄iir? ?i?灄i?i1 ?i?灄i 180 1236054043720?软i1 ?1灄1斿i灄1?d仿14?8搁? 9 ? ?,?5 ? ?5 ? ?%? ? ?5?% ?1 ? ? ? ? ? ? ? 120120 40 40 70 70 90 90 65 656060 25 25 20 205050? ?软i1 ?1灄1斿i灄1?d仿
展开阅读全文