thank you very much!
问题描述：
thank you very much!
已知关于X,Y的方程组X+2Y=2A+1,X-2Y=4A-3的解是一对正数,求
)A的取值范围
(2)化简|3A-1|+|A-2|
答
(1)将式子编号为：①,②,
则,①+②得：2X=6A-2
∵X〉O∴（6A-2）/2〉0
∴A〉1/3
同理,由Y〉0推得A〈2
所以,1/3
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