（1）+（2）得
3x=3+6a
所以,x=1+2a
代入（1）可解的：
y= - 2+2a
x+y=4a-1＜3
∴ 4a＜4
解得,a＜1如果满意，请点右上角“采纳答案”
已知x,y的方程组｛x-y=3 2x+y=6a,的解,满足不等式x+y
已知x,y的方程组｛x-y=3 2x+y=6a,的解,满足不等式x+y
数学人气：991 ℃时间：2019-12-08 07:17:25
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