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~

来源：学生作业帮助网 编辑：作业帮 时间：2024/04/27 13:53:28

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?用一元一次方程解答~
设蓝布X米,则黑布(138-x)米
3x+(138-x)5=540
3x+690-5x=540
690-2x=540
2x=150
x=75
所以黑布:138-75=63米
蓝布：75乘3=225元
黑布：63乘5=315元

3*x+(138-x)*5=540

设买蓝布料X米，则黑布料为（138-X),列方程式：3x+(138-x)=540
解得：x=70，
蓝布料70m，黑布料68m

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? 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? 列方程并解答 买两种布料共138m,花了540元.其中篮布料每米3元,黑布料每米5元,两种布料个买列方程并解答买两种布料共138m,花了540元.其中篮布料每米3元,黑布料每米5元,两种布料个买了多少米? 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? 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?（用方程解） 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?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,黑米料每米5元,两种布料各买了多少米? 买两种布料共138m,花540元,其中,蓝布每米3元,黑布每米5元,两种各买了多少米 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?要列方程, 买两种布料共138m,花了540元,蓝布料每米3元,黑的每米5元,两种各买了几米 买两种布料共183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 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? 一名顾客用540元买了2种布料共138尺,其中蓝布料每尺3元,黑布料每尺5元,这2种布料各买了多少? 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