1.在一条长三百米的公路一旁栽树,每隔五米栽一棵,一共要栽多少棵?2.父亲今年49岁,女儿23岁,几年前的父亲是女儿的年龄的3倍?3.一艘轮船从宜昌顺水航行到上海,静水航行的速度每小时27km,水

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