19+199+1999+19999+199999的简便算法(递等式)怎么写

2024-11-22 01:56:48
推荐回答(5个)
回答1:

19+199+1999+19999+199999
=20-1+200-1+2000-1+20000-1+200000-1
=222220-5
=2222215

回答2:

199999+19999+1999+199+19=200000-1+20000-1+2000-1+200-1+20-1=200000+20000+2000+200+20-5=222220-5=222215

回答3:

19+199+1999+19999+199999=222215

回答4:

=586555555555555555=555555=5=5=555555=55555

回答5:

222215