作业帮Maths question(急）本来用10元钱买一盒饼干是够的,但要再买一袋牛奶就不够了!今天是元旦,你买的饼干可以打9折,给了10元,找了0.8元.一盒饼干可比一袋牛奶贵7.9元.买一盒饼干一袋牛奶.
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/18 22:38:37
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Maths question(急）本来用10元钱买一盒饼干是够的,但要再买一袋牛奶就不够了!今天是元旦,你买的饼干可以打9折,给了10元,找了0.8元.一盒饼干可比一袋牛奶贵7.9元.买一盒饼干一袋牛奶.
Maths question(急）
本来用10元钱买一盒饼干是够的,但要再买一袋牛奶就不够了!今天是元旦,你买的饼干可以打9折,给了10元,找了0.8元.一盒饼干可比一袋牛奶贵7.9元.买一盒饼干一袋牛奶.
Maths question(急）本来用10元钱买一盒饼干是够的,但要再买一袋牛奶就不够了!今天是元旦,你买的饼干可以打9折,给了10元,找了0.8元.一盒饼干可比一袋牛奶贵7.9元.买一盒饼干一袋牛奶.
设饼干x,牛奶y
0.9x+y=9.2 (1)
x-y=7.9(20
（1)+(2)得：
1.9x=17.1
x=9
y=11
希望能给你帮助!
你是要问一盒饼干和一袋牛奶各多少钱么？？
如果是的话，饼干9元，牛奶1.1元。
Maths question(急）本来用10元钱买一盒饼干是够的,但要再买一袋牛奶就不够了!今天是元旦,你买的饼干可以打9折,给了10元,找了0.8元.一盒饼干可比一袋牛奶贵7.9元.买一盒饼干一袋牛奶.
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