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,两种布料共多少米? 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） 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,黑布料每米5元,两种布各料多少元? 顾客用540元买下两种布料共46米,其中蓝布料每米9元,黑布料每米15元,求两种布料各买了多少?