a^n+5 - a^n+4 chia hết cho 30
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27 tháng 12 2017
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28 tháng 12 2017
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P
1
14 tháng 8 2019
\(b,n^2\left(n^4-1\right)\)
\(=n^2\left(n^2+1\right)\left(n^2-1\right)\)
Ta có:\(n^2-1;n^2;n^2+1\) là 3 số nghuyên liên tiếp
\(\Rightarrow n^2\left(n^2+1\right)\left(n^2-1\right)⋮60\)
\(\Rightarrowđpcm\)
=>
đề bài hỏi j
chứng minh với mọi a,b thuộc Z thì ....