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? 买两种布共138米花了540元其中蓝布料每米3元黑布每米5元俩种布料各多少米 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,花了540元,蓝布料每米3元,黑的每米5元,两种各买了几米