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简算题 99+199+1999+19999+4

分类: 作业答案 • 2021-12-29 16:00:08

问题描述：

答

99+199+1999+19999+4
=(100-1)+(200-1)+(2000-1)+(20000-1)+(1+1+1+1)
=(100+200)+(2000+20000)+(1-1)+(1-1)+(1-1)+(1-1)
=300+22000+0+0+0+0=22300

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简算题 99+199+1999+19999+4

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