买2瓶白酒,12瓶啤酒共付42元,已知一瓶白酒与8瓶啤酒的价钱相等,每瓶白酒和啤酒各多少元,
问题描述:
买2瓶白酒,12瓶啤酒共付42元,已知一瓶白酒与8瓶啤酒的价钱相等,每瓶白酒和啤酒各多少元,
答
设白酒X元,啤酒Y元 X=8Y 12Y+2X=42 得X=12 Y=1.5
买2瓶白酒,12瓶啤酒共付42元,已知一瓶白酒与8瓶啤酒的价钱相等,每瓶白酒和啤酒各多少元,
设白酒X元,啤酒Y元 X=8Y 12Y+2X=42 得X=12 Y=1.5