Question

妍

求解這兩題🙏🏻

1. 設n=1a34b是一個五位數,其中a、b分別是n的千位數與個位數,若36/n,求n的最大值。
9|1+2+3+4+b= 8+a+b=a+b= 1010
G= 8.b = 2
0:18342
2. 設n∈N,說明(n²-n)必為6的倍數。
nin²)
KEN...
=nchy Din-1) n = 6k.bk+1.6l+2.6k+3.6k+4.6k+5
B
nyl = bk. bk. 6k+1.6l+2.6k+3.6k+4.
nt (= tk+1.6k+2.6k+3.6k+4. tk+5. 6l+6
3m+25
N ++ to m