设爷爷今年x岁
则 1980-x为出生年份
由题意得 x/1980-x = 1/19 解之得x=99
答:莉莉的爷爷今年99岁.
汗 相当长寿= =
1980年莉莉出生时,她爷爷的年龄是他自己出生年份的19分之1,莉莉爷爷今年几岁
1980年莉莉出生时,她爷爷的年龄是他自己出生年份的19分之1,莉莉爷爷今年几岁
其他人气:647 ℃时间:2020-04-09 22:50:31
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