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?

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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?
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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?

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?
设蓝布料为X米,黑布料为Y米
3x+5y=540
x+y=138
所以
3x+3y=414
把此条和第一条相减
2y=126
y=63
x=75
所以：蓝布料为 75*3=225元
黑布料为63*5=315元

设蓝布x元 黑布540-x元
x/3+(540-x)/5=138
x=225
540-X=315
蓝布225元黑布315元

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