初中数学 1.2.4绝对值3 (2)

1、14.2.1 -?ccccc ?ccc弰 (1)?S UI GoSh ?UI仿宋仿h ?UIxt ?zU?宋 SGUUoS? ?zU?UIxt仿zU?仿z?仿h(7-?UU? 1-?U?Ua)2-1001010km10km?c? ?c?cc? ? ?66? ?ial ? ?c?l 6?l? ?ff ?6?-?6? ?6? ?ci ? c?c? ?6弰 ?c ? ? 6?c?l ?c? ?6?. ?lc ?c ? ?cci6ial ? ?6f?6? ?6?cc ?-?fc?f? ?cci6ial 10kmABo?c ?c?cc cc6?cc ?c弰 ?1?:3 ?1f1 ?ci6? ?c弰l?

2、?cf?6弰 ?6cfc弰? ? ?1f1 ? ?c? ?ci6? ?c弰l? ?cf?6弰 ?6cfc弰? ?ABA ?1f1 ?ci6? ?c弰l? ( ) ? ?6cfc弰? ?B ?1f1 ?ci6? ?c弰l? ( ) ? ?c?6cfc弰? ?ci6? ?c弰l? ( ) ?6 ?cfc弰? .?3324?弰?6弰c? ?6?-?c ?ccccc ?ccc弰 6cc弰c ?ci?:?6? ?弰l ?6? ?6?cc?6? 6c弰c? ?cc? ?ci6? ?c弰c? ?fc6? ? ?6?ccccc ?ccc弰(absolute value ) ? c?cc6 ? ?c弰 c?c.

3、?aaa?cc?cc:100-100 1 24 5-1-2-5-43-31010 ,1010 00 33 , 33 22 5 ?6? cc6?弰 ?i?6弰 ? ?6?-?ccccc ?ccc弰 ?6? ?6弰 ?6?cc ?6?-?l ?1?6?ul ?rlal? ?ussta ?rsil? ?iu?u9 l ?ussta ?uiul?o ?r?tluo. ?ul ?uisr? ?ussta ?rsil? ?iu?u9 ?uslo l?u?t9-?t9 ?uiusta ?r?tluo. 0 ?us ?rsil? ?iu?u9 0.aaaa?sr: ?rlal? ?ta ?敬ist湯tl aa

4、 ?uisr? ?ta ?敬ist湯tl 0aa ?敬ist湯tl 0? ?6? ?ccccc ?cc弰 ?cc?6? ?c? ?6? ?6弰 ?6?cc ?6?7?c ? ?6?-?ccccc ?ccc弰 ?:?, 6, 8, 9 . 3,25,112,100. 0?cci ?f?8?1? ?6? ? ?c ?-?ic? ?lc-6f6?c6a ?1? ?c弰: (1) ?ccccl6 cc6?弰 ?i?6弰 ?6?l? ?-?6? ?6? cc6?弰 ?i?6弰 ?-?6? ?c?l? ( ) (2) ?ccccl6 cc6?弰 ?i?6弰 ?cc? ?ccccc ?ccccc弰 ?6?

5、?cc ?6?l? ?-?6? ?6? cc6?弰 ?i?6弰 ?-?6? ?c?l?( ) (3) ? ?6? ?ccccc ?ccc弰 cf?6弰 ?lf ?6?l? ?c ?6?cc?6? 6c弰c? ?6? ?弰l cf?ci ?l ?cc ?c?c6?( ) (4) ? ?6? ?ccccc ?ccc弰 cf?6弰 ?lf ?6?l? ?c ?6?cc?6? 6c弰c? ?6? ?弰l ?6? ?c弰l? cf?1i ? ?c?l?( )9?c?l弰: 5c? ?l? ?f?(? ? )? :?c?f? ?c?c ?ccf? ?i ?ccc ?f? ?c?cc ?6? ?cc ?c?ccf? ?c?ccc? ?f? ?cc ?6? ?cc