6+66+666+6666+.+66666.6(N个)(N等于或大于一)=
6+66+666+6666+.+66666.6(N个)(N等于或大于一)=
给出步骤求出结果
给出步骤求出结果
数学人气:159 ℃时间:2020-04-24 07:25:15
优质解答
是通项6/9(10^n-1) 6/9×[10(1-10^n)]/(1-10)
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