数学题 99+99╳99+999╳999╳999

2024-12-01 01:05:50
推荐回答(5个)
回答1:

=99*(99+1)+999*(1000*999-1*999)
=99*100+999*(999000-999)
=9900+999*998001
=9900+(1000-1)*998001
=9900+1000*998001-998001
=9900+(998001000-998001)
=9900+997002999
=997012899

把999看成是1000-1,就直接转换成加法了

回答2:

=99*(99+1)+999*(1000*999-1*999)
=99*100+999*(999000-999)
=9900+999*998001
=9900+(1000-1)*998001
=9900+1000*998001-998001
=9900+(998001000-998001)
=9900+997002999
=997012899

回答3:

=99*(99+1)+999*(1000*999-1*999)
=99*100+999*(999000-999)
=9900+999*998001
=9900+(1000-1)*998001
=9900+1000*998001-998001
=9900+(998001000-998001)
=9900+997002999
=997012899 书上看的

回答4:

99+99*99+999*999*999=(100-1)+(100-1)(100-1)+(1000-1)(1000-1)==(100-1)[1+(100-1)]+(10^6-1)=99*100-1+10^6=9899+10^6=1009899

回答5:

计算器