爷爷今年七十岁了可她只过了十七个生日他的生日是几月 张爷爷60岁，只过啦15个生日，他的生日是几月几日？
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2\u670829\u65e5\u662f\u516c\u5386\u95f0\u5e74\u4e2d\u7684\u7b2c60\u5929\uff0c\u79bb\u5168\u5e74\u7684\u7ed3\u675f\u8fd8\u6709306\u5929\u30022\u670829\u65e5\u4e0d\u5728\u666e\u901a\u5e74\u4efd\u4e2d\u51fa\u73b0\uff0c\u53ea\u5728\u95f0\u5e74\u4e2d\u51fa\u73b0\u3002\u901a\u5e38\u516c\u5143\u5e74\u4efd\u53ef\u4ee5\u88ab4\u6574\u9664\u7684\u662f\u95f0\u5e74\u3002
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60/4=15\uff0c\u6240\u4ee5\u5f20\u7237\u723760\u5c81\uff0c\u53ea\u8fc7\u4e8615\u4e2a\u751f\u65e5\u3002
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二月二十九日，四年才出现一次。
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