文档介绍：779+116-338=878-664+266=469+399-545=522+156-312=815-(434+122)=464+196-329=192+(425-365)=596-430+345=875-(481+253)=965-645+325=616+199-395=798+101-314=298+(517-453)=529-385+110=304-114+232=332+411-299=756-(232+218)=233+(592-280)=.. ..619-(239+309)=325+(493-215)=516+194-256=387-(401-157)=492+337-488=842-(197+457)=712-(421+185)=607+299-370=536-(159+220)=67+(814-582)=465+287-525=224+669-491=779-(481+194)=524-374+280=801-(354+377)=481-221+185=324+(565-268)=.. ..880-584+257=853-(654+105)=862-(462+256)=455+321-210=286+336-373=764+171-742=628+165-699=489+379-527=369-(384-131)=852-(877-546)=993-906+373=746+123-545=499+(729-573)=739-(539+113)=596+(543-168)=608+297-565=447+221-320=.. ..566-(857-670)=760-(448+157)=465-(515-282)=693-512+135=467-451+188=790-733+168=261+720-826=544-(296+217)=428+216-526=577+(421-190)=207+(753-691)=258+352-473=751+174-735=741+138-241=709+(435-323)=674+133-435=488+364-731=625-380+282=.. ..215-(898-704)=261+227-229=710+227-860=566-477+173=454+(986-795)=348-(133+165)=334-145+476=733+134-513=141+(614-170)=556+(362-156)=549-309+214=216-(491-393)=762-(388+107)=429-(606-486)=892-(153+449)=484+489-740=794-545+324=.. ..223+(905-715)=620+201-711=473+254-421=841-571+214=603-(318+171)=216+(365-246)=693-(296+291)=434+(490-122)=421-291+438=267-(571-434)=793-(551+200)=224+(692-273)=463+421-747=527+240-256=454-174+589=451+314-315=715+151-329=.. ..831+105-685=886-(575+101)=841-571+114=425+225-584=857+102-733=994-772+482=591+310-802=317+427-578=434+(306-145)=554-(247+186)=830+137-712=150+(554-554)=297+426-337=377-325+446=271+(585-326)=403+161-236=219-149+290=.. ..443+490-689=607+116-544=744+(253-104)=309-205+234=534-280+138=673+111-215=392+157-481=567-(742-340)=749-689+487=228-191+183=346-140+262=416-(408-113)=290+564-563=609-204+355=138+269-226=812-755+130=769-(557+120)=858-279+191=.. ..211+561-105=707-(289+349)=633+273-421=678+220-362=733+251-550=101+(836-732)=532+284-286=714-540+479=726-(299+129)=478+421-515=196+186-231=700+196-792=755-537+408=661+147-392=739-(33