9+98+998+9998+99998+……+9999999998等于多少?怎样运算?求详解.
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9+98+998+9998+99998+……+9999999998等于多少?怎样运算?求详解.
![9+98+998+9998+99998+……+9999999998等于多少?怎样运算?求详解.](/uploads/image/z/6026144-32-4.jpg?t=9%2B98%2B998%2B9998%2B99998%2B%E2%80%A6%E2%80%A6%2B9999999998%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F%E6%80%8E%E6%A0%B7%E8%BF%90%E7%AE%97%3F%E6%B1%82%E8%AF%A6%E8%A7%A3.)
9+98+998+9998+99998+……+9999999998
=(10-1)+(100-2)+(1000-2)+(10000-2)+···(1000000000-2)
=11111111110-(2×9+1)
=11111111110-(20-1)
=11111111110-20+1
=11111111090+1
=11111111091
不懂还可问,满意请及时采纳!o(∩_∩)o
=(10-1)+(100-2)+(1000-2)+(10000-2)+···(1000000000-2)
=11111111110-(2×9+1)
=11111111110-(20-1)
=11111111110-20+1
=11111111090+1
=11111111091
不懂还可问,满意请及时采纳!o(∩_∩)o