Question

小学四年级奥数题

有谁知道29+299+2999......(1000个9)咋算

Answer 1

29+299+2999......(1000个9)

=30+300+3000+……+3000……0（1000个）-1000
=333……30（1000个3）-1000
=33……3（997个3）2330

Answer 2

30+300+3000+....+3000...0000(1000个0)-1000
=33333....333330(1000个3)-1000
=333..33332330
2前面997个3

Answer 3

原式=30-1+300-1+3000-1+……+3（1000个0）-1=33333333……33330（1000个3）-1000=33333……3332330

Answer 4

29+299+2999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999????????????????????????????????

Answer 5

29+299+2999+29999......(有1000个9)
=30+300+3000+……（有1000个）-1000
=3.......3（有1000个3）-1000
=33333……3（有997个3）
好了！

Answer 6

30+300+000+30000+......+3000000(1000个0)-1*1000=3333...332330