作业帮 > 数学 > 作业

买两种布料共138m,花了540元,其中蓝布料每米3元,黑布料每米5元,两种布料各买了多少米?

来源：学生作业帮 编辑：百度作业网作业帮 分类：数学作业 时间：2024/06/07 08:35:29
买两种布料共138m,花了540元,其中蓝布料每米3元,黑布料每米5元,两种布料各买了多少米?
买两种布料共138m,花了540元,其中蓝布料每米3元,黑布料每米5元,两种布料各买了多少米?
设黑布有x米
所以蓝布有138-x米
所以
3（138-x）+5x=540
414-3x+5x=540
2x=126
x=63
138-x=75
所以黑布有63米,蓝布有75米
买两种布料共138米,花了540元.其中蓝布料每米3元,黑布料每米5元,两种布料共多少米? 买两种布料共138m,花了540元.其中蓝布料每米3元,黑布料每米5元,两种布料各买了多少米?（方程解答） 买两种布料共138m,花了540元,其中蓝布料每米3元,黑布料每米5元,两种布料各买了多少米? 买两种布料共138m,花了540元,其中蓝布料每米5元,黑布料每米3元,两种布料各买了多少米? 买两种布料共138m,花了540元.其中蓝布料每米3元,黑布料每米5元,两种布料各买了多少米?(要式子、要答案.) 买两种布料共138M,花了540元,其中蓝布料每米3元,黑布料每米5元.两种布料各买了多少米?用一元一次方程解答~ 买两种布料共138m,花了540元.其中蓝布料每米3元,黑布料每米5元,两种布料各买了多少米?（用方程解） 买两种布料共540元.其中蓝布料每米3元,黑布料每米5元,两种布料各买多少米 买两种布料共138米,花了540元.其中蓝布料每米3元,黑布料每米5元,两种布料各买了多少米? 买两种布料共138m,花了540元,其中蓝布料每米3元,黑布料每米5元,两种布各料多少元? 一人用540元买了两种布料共138米,其中蓝布料每米3元,黑布料每米5元,球两种布料各多少元? 买两种布料共138m,花了540元,其中蓝布料每米3元,黑米料每米5元,两种布料各买了多少米?