用简便方法计算下列各题，要求过程
489+544+232+475+108+125+13+24226+154+346+372+108+256+2083300-296-274-104-208-118-353-...
489+544+232+475+108+125+13+24
226+154+346+372+108+256+208
3300-296-274-104-208-118-353-120-127
10200-344-489-502-711-1230-626-174-224 展开
226+154+346+372+108+256+208
3300-296-274-104-208-118-353-120-127
10200-344-489-502-711-1230-626-174-224 展开
1个回答
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489+544+232+475+108+125+13+24
=489+544+232+475+108+125+11+26
=489+11+544+26+232+108+475+125
=500+570+340+600
=2010
226+154+346+372+108+256+208
=226+154+346+374-2+108+256+208
=226+374+154+346+108+208+256-2
=600+500+316+254
=1100+570
=1670
3300-296-274-104-208-118-353-120-127
= 3300-296-274-104-208-118-353-120-126-1
=3300-(296+104)-(274+126)-(208+118+353+120+1)
=3300-400-400-800
=1700
10200-344-489-502-711-1230-626-174-224
=10200-(489+711)-(626+174)-344-502-1230-224
=10200-1200-800-(344+502+1230+224)
=8200-2300
=5900
=489+544+232+475+108+125+11+26
=489+11+544+26+232+108+475+125
=500+570+340+600
=2010
226+154+346+372+108+256+208
=226+154+346+374-2+108+256+208
=226+374+154+346+108+208+256-2
=600+500+316+254
=1100+570
=1670
3300-296-274-104-208-118-353-120-127
= 3300-296-274-104-208-118-353-120-126-1
=3300-(296+104)-(274+126)-(208+118+353+120+1)
=3300-400-400-800
=1700
10200-344-489-502-711-1230-626-174-224
=10200-(489+711)-(626+174)-344-502-1230-224
=10200-1200-800-(344+502+1230+224)
=8200-2300
=5900
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