(5-5)÷45=0,(55-10)÷45=1,(555-15)÷45=12找规律

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(5-5)÷45=0,(55-10)÷45=1,(555-15)÷45=12找规律
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(5-5)÷45=0,(55-10)÷45=1,(555-15)÷45=12找规律
(5-5)÷45=0,(55-10)÷45=1,(555-15)÷45=12找规律

(5-5)÷45=0,(55-10)÷45=1,(555-15)÷45=12找规律
(5-5)÷45=0,
(55-10)÷45=1,
(555-15)÷45=12
(5555--20))÷45=123
(55555-25))÷45=1234
括号中被减数是第几个式子就有几个5,括号中的减数依次增加5,结果商按自然数的顺序依次增加.

(5555-20)除以45=123… (55555-25)除以45=1234

(555...5 - 5n) ÷ 45 = 123.....(n-1)
(n个5)

(n个5-5n)/45=小于n的正整数依次排列