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?

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/16 04:28:10
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?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?长方形长是宽的3.6倍,周长是39.1cm,长宽各多少厘米?面积

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?
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?

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?
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

设宽x,则长3.6x,列方程3.6x*2+2*x=39.1.
求得x=4.25
所以宽4.25,长15.3..面积=65.025

设宽为Xcm
(x+3.6x)*2=39.1
x=4.25
长=4.25*3.6=15.3
面积=15.3*4.25=65.025

设宽为X、长就为3.6X、
得方程(X+3.6X)*2=39.1
解得、X=4.25
宽是4.25、长是4.25*3.6=15.2
面积是4.25*15.2=64.6