ثابت کنید: N/a[SUB]1[/SUB]a[SUB]2[/SUB]a[SUB]3[/SUB]a[SUB]4[/SUB]...a[SUB]k=N/[/SUB]a[SUB]1[/SUB]a[SUB]2[/SUB]a[SUB]3[/SUB]...a[SUB](k-1)[/SUB]999999999999999999999999999999999...99999999999
ثابت کنید: N/a[SUB]1[/SUB]a[SUB]2[/SUB]a[SUB]3[/SUB]a[SUB]4[/SUB]...a[SUB]k=N/[/SUB]a[SUB]1[/SUB]a[SUB]2[/SUB]a[SUB]3[/SUB]...a[SUB](k-1)[/SUB]999999999999999999999999999999999...99999999999