2020年是闰年吗？请你通过算式说明一下。 1880--2020哪几年是闰年
2020\u5e74\u662f\u95f0\u5e74\u5417\uff1f\u8bf7\u4f60\u901a\u8fc7\u8ba1\u7b97\u8bf4\u660e\u4e00\u4e0b\u30022020\u662f4\u7684\u500d\u6570\uff0c\u6240\u4ee5\u662f\u95f0\u5e74\u3002
1880\u5e74\u52302020\u5e74\u4e2d\u662f\u95f0\u5e74\u7684\u6709\u4ee5\u4e0b\u8fd9\u4e9b\u5e74\u4efd\uff1a
1880\u5e74\u30011884\u5e74\u30011888\u5e74\u30011892\u5e74\u30011896\u5e74\u30011904\u5e74\u30011908\u5e74\u30011912\u5e74\u30011916\u5e74\u30011920\u5e74\u30011924\u5e74\u30011928\u5e74\u30011932\u5e74\u30011936\u5e74\u30011940\u5e74\u30011944\u5e74\u30011948\u5e74\u30011952\u5e74\u30011956\u5e74\u30011960\u5e74\u30011964\u5e74\u30011968\u5e74\u30011972\u5e74\u30011976\u5e74\u30011980\u5e74\u30011984\u5e74\u30011988\u5e74\u30011992\u5e74\u30011996\u5e74\u30012000\u5e74\u30012004\u5e74\u30012008\u5e74\u30012012\u5e74\u30012016\u5e74\u30012020\u5e74
\u95f0\u5e74\u5206\u4e3a\u666e\u901a\u95f0\u5e74\u548c\u4e16\u7eaa\u95f0\u5e74\u3002
1\u3001\u666e\u901a\u95f0\u5e74:\u516c\u5386\u5e74\u4efd\u662f4\u7684\u500d\u6570\u7684\uff0c\u4e14\u4e0d\u662f100\u7684\u500d\u6570\uff0c\u4e3a\u95f0\u5e74\u3002\uff08\u59822004\u5e74\u5c31\u662f\u95f0\u5e74\uff09\uff1b
2\u3001\u4e16\u7eaa\u95f0\u5e74:\u516c\u5386\u5e74\u4efd\u662f\u6574\u767e\u6570\u7684\uff0c\u5fc5\u987b\u662f400\u7684\u500d\u6570\u624d\u662f\u95f0\u5e74\uff08\u59821900\u5e74\u4e0d\u662f\u4e16\u7eaa\u95f0\u5e74\uff0c2000\u5e74\u662f\u4e16\u7eaa\u95f0\u5e74\uff09
\u6269\u5c55\u8d44\u6599
\u95f0\u5e74\u7684\u8ba1\u7b97\u65b9\u6cd5\uff1a
\uff08\u6309\u4e00\u56de\u5f52\u5e74365\u59295\u5c0f\u65f648\u520645.5\u79d2\uff09
1\u3001\u666e\u901a\u5e74\u80fd\u88ab4\u6574\u9664\u4e14\u4e0d\u80fd\u88ab100\u6574\u9664\u7684\u4e3a\u95f0\u5e74\u3002\uff08\u59822004\u5e74\u5c31\u662f\u95f0\u5e74\uff09
2\u3001\u4e16\u7eaa\u5e74\u80fd\u88ab400\u6574\u9664\u7684\u662f\u95f0\u5e74\u3002\uff08\u59822000\u5e74\u662f\u95f0\u5e74\uff09
3\u3001\u5bf9\u4e8e\u6570\u503c\u5f88\u5927\u7684\u5e74\u4efd\uff0c\u8fd9\u5e74\u5982\u679c\u80fd\u6574\u96643200\uff0c\u5e76\u4e14\u80fd\u6574\u9664172800\u5219\u662f\u95f0\u5e74\u3002\u5982172800\u5e74\u662f\u95f0\u5e74\uff0c86400\u5e74\u4e0d\u662f\u95f0\u5e74\uff08\u56e0\u4e3a\u867d\u7136\u80fd\u6574\u96643200\uff0c\u4f46\u4e0d\u80fd\u6574\u9664172800\uff09\uff08\u6b64\u6309\u4e00\u56de\u5f52\u5e74365\u59295h48'45.5''\u8ba1\u7b97\uff09\u3002
\u6b64\u5916\uff0c\u5982\u4f9d\u7167\u73b0\u6709\u592a\u9633\u5e74\u7684\u957f\u5ea6\u4e0e\u4e0a\u8ff0\u95f0\u5e74\u89c4\u5219\uff0c\u6bcf8000\u5e74\u53c8\u7ea6\u5dee\u4e00\u65e5\uff0c\u56e0\u6b64\u7ea6\u7ff0\u00b7\u8d6b\u6b47\u5c14\u63d0\u8bae\u6bcf\u90224000\u7684\u500d\u6570\u4e0d\u95f0\uff0c\u5982\u897f\u51434000\u5e74\u3002
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u95f0\u5e74 \uff08\u5386\u6cd5\u4e2d\u7684\u540d\u8bcd\uff09
公元纪年（阳历）的年份被4除尽，这一年就是闰年。所以2020年是闰年。（今年二月有29天）
2020÷400=5……20，
2020÷4=505，
2020不能被400整除，能被4整除，闰年。
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