1+2=3
55-5=50
3+2=5
50-5=45
5+2=7
45-5=40
.
当n为奇数时,第n个是n,
当n为偶数时,第n个是55-5×(n-2)÷2当n为偶数时,第n个是55-5×(n-2)÷2还是60-2.5*n还是n=60-5/2n?当然是55-5×(n-2)÷2=60-2.5*n
1,55,3,50,5,45,7...找规律
1,55,3,50,5,45,7...找规律
1,55,3,50,5,45,7,(),(),().第n个,是多少?
1,55,3,50,5,45,7,(),(),().第n个,是多少?
数学人气:138 ℃时间:2020-02-17 19:54:55
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