199+299+399+499+599+699+799+899等于多少

2025-12-17 10:01:07
推荐回答(1个)
回答1:

199+299+399+499+599+699+799+899
=200+300+400+500+600+700+800+900-8
=(200+900)x8÷2-8
=1100x4-8
=4400-8
=4392