设上衣X元,裤子Y元10X+10Y=200012X+14Y=2560Y=200-X12X+14(200-X)=25602X=240X=120买一件上衣要120元
设上衣X元,裤子Y元10X+10Y=200012X+14Y=2560Y=200-X12X+14(200-X)=25602X=240X=120