考點(diǎn):運(yùn)算定律與簡(jiǎn)便運(yùn)算
專題:運(yùn)算定律及簡(jiǎn)算
分析:①264+98把98轉(zhuǎn)化成100-2,即264+100-2,由此進(jìn)行計(jì)算即可.
②387+102把102轉(zhuǎn)化成100+2,即387+100+2,由此進(jìn)行計(jì)算即可.
③466-103把減去103轉(zhuǎn)化成減去100再減去3,即466-100-3,由此進(jìn)行計(jì)算即可.
④587-198把減去198轉(zhuǎn)化成減去200,多減去2,再加上2即可,即587-200+2,由此進(jìn)行計(jì)算即可.
⑤136+78+64運(yùn)用加法的交換律及結(jié)合律進(jìn)行計(jì)算即可.
⑥247-(147+40)運(yùn)用一個(gè)數(shù)減去兩個(gè)數(shù)的和,可以用這個(gè)數(shù)分別減去這兩個(gè)數(shù).
⑦163+278+37運(yùn)用加法的交換律及結(jié)合律進(jìn)行計(jì)算即可.
⑧247-(147+40)運(yùn)用一個(gè)數(shù)連續(xù)減去兩個(gè)數(shù),可以用這個(gè)數(shù)分別減去這兩個(gè)數(shù).
解答:
解:①264+98
=264+100-2
=364-2
=362
②387+102
=387+100+2
=487+2
=489
③466-103
=466-100-3
=366-3
=363
④587-198
=587-200+2
=387+2
=389
⑤136+78+64
=(136+64)+78
=200+78
=278
⑥247-(147+40)
=247-147-40
=100-40
=60
⑦163+278+37
=(163+37)+278
=200+278
=478
⑧256-182-18
=256-(182+18)
=256-200
=56
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡(jiǎn)便方法計(jì)算.