设n=666.66*9*7777.7,(注:有n个6,n个7),则n的各位数字之和是多少?
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![设n=666.66*9*7777.7,(注:有n个6,n个7),则n的各位数字之和是多少?](/uploads/image/z/1599815-47-5.jpg?t=%E8%AE%BEn%3D666.66%2A9%2A7777.7%2C%28%E6%B3%A8%3A%E6%9C%89n%E4%B8%AA6%2Cn%E4%B8%AA7%29%2C%E5%88%99n%E7%9A%84%E5%90%84%E4%BD%8D%E6%95%B0%E5%AD%97%E4%B9%8B%E5%92%8C%E6%98%AF%E5%A4%9A%E5%B0%91%3F)
设n=666.66*9*7777.7,(注:有n个6,n个7),则n的各位数字之和是多少?
设n=666.66*9*7777.7,(注:有n个6,n个7),则n的各位数字之和是多少?
设n=666.66*9*7777.7,(注:有n个6,n个7),则n的各位数字之和是多少?
66*77*9 = 45738;
666*777*9 = 4657338;
6666*7777*9 = 466573338;
66666*77777*9 = 46665733338;
各位之和 = 4 + 5 + 7 + 8 + 6(n - 2) + 3(n - 1)
= 9(n + 1)
没看懂你的题目,是n=6666....乘以9乘以777.....吗,然后怎么会有n个6,n个7呢?