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本页是我个人的沙盒，作为草稿或测试用。
$\because 0^2=0~~~~0^4=0$
$\therefore 0^4{\div} 0^2=0{\div} 0$
$\because 0^4{\div} 0^2=0^2=0$
$\therefore 0{\div} 0=0$