perimeter:周长、square ：正方形
正方形周长是7/2m,用了周长的5/8,还剩多少?
（1-5/8）＊7/2m＝21/16m
（如果没错应该是这样 ）
If the perimeter of a square is 7/2m,use5/8 of its perimeter,what's the rest number?
If the perimeter of a square is 7/2m,use5/8 of its perimeter,what's the rest number?
英语人气：633 ℃时间：2020-02-02 23:37:31
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