分析:(1)把722看作700+22,把301看作300+1,然后運(yùn)用減法的性質(zhì)以及加法交換律與結(jié)合律簡(jiǎn)算;
(2)(4)(5)運(yùn)用加法交換律和結(jié)合律簡(jiǎn)算;
(3)運(yùn)用減法的性質(zhì)簡(jiǎn)算;
(6)把463看作440+23,把148看作140+8,然后運(yùn)用減法的性質(zhì)以及加法交換律與結(jié)合律簡(jiǎn)算.
解答:解:(1)722-301,
=700+22-(300+1),
=700-300+(22-1),
=400+21,
=421;
(2)235-190+165,
=(235+165)-190,
=400-(200-10),
=400-200+10,
=210;
(3)986-169-131,
=986-(169+131),
=986-300,
=686;
(4)167+141+359+33,
=(167+33)+(141+359),
=200+500,
=700;
(5)425+438+175,
=(425+175)+438,
=600+438,
=1038;
(6)463-148,
=440+23-(140+8),
=(440-140)+(23-8),
=300+15,
=315.
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.