以下三道题该怎样巧算
1847-64-136+628-19284993+3996+5997+8481348-1234+2822-1424+2095+6234+1805-1576-1426-10...
1847-64-136+628-1928
4993+3996+5997+848
1348-1234+2822-1424+2095+6234+1805-1576-1426-1074-1048-1822 展开
4993+3996+5997+848
1348-1234+2822-1424+2095+6234+1805-1576-1426-1074-1048-1822 展开
2个回答
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一、1847-64-136+628-1928
=1847-(64+136)-(1928-628)
=1847-200-1300
=347
二、4993+3996+5997+848
=(5000-7)+(4000-4)+(6000-3)+848
=5000+4000+6000+848-(7+4+3)
=15000+848-14
=15000+834
=15834
三、1348-1234+2822-1424+2095+6234+1805-1576-1426-1074-1048-1822
=(2822-1822)+(6234-1234)+(1348-1048)+(2095+1805)-(1426+1074)-(1424+1576)
=1000+5000+300+3900-2500-3000
=6000+4200-5500
=500+4200
=4700
=1847-(64+136)-(1928-628)
=1847-200-1300
=347
二、4993+3996+5997+848
=(5000-7)+(4000-4)+(6000-3)+848
=5000+4000+6000+848-(7+4+3)
=15000+848-14
=15000+834
=15834
三、1348-1234+2822-1424+2095+6234+1805-1576-1426-1074-1048-1822
=(2822-1822)+(6234-1234)+(1348-1048)+(2095+1805)-(1426+1074)-(1424+1576)
=1000+5000+300+3900-2500-3000
=6000+4200-5500
=500+4200
=4700
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