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?

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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?

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

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