长方形长是宽的3.6倍,周长是39.1cm,长宽各多少厘米?面积呢?
问题描述：
长方形长是宽的3.6倍,周长是39.1cm,长宽各多少厘米?面积呢?
答
解设长方形宽为x
则长为3.6x
则由周长是39.1cm
则2（x+3.6x）=39.1
即9.2x=39.1
解得x=4.25cm
故长方形长为15.3cm
宽为4.25cm
故面积为4.25×15.3=65.025cm^2能稍微在详细些吗？🙏设长方形宽为x则长为3.6x则由周长是39.1cm由长方形周长公式2（长+宽）=周长则2（x+3.6x）=39.1即2×4.6x=39.1即9.2x=39.1两边除以9.2解得x=4.25cm故长方形长为3.6x=3.6×4.25=15.3cm宽为4.25cm故长方形面积为=长×宽=4.25×15.3=65.025cm^2追