已知正比例函数y 1 =k 1 x,反比例函数 y 2 = k 2 x . (1)若y=y 1 +y 2 ,当x=1时,y=-3;当x=-2时,y=3.求y与x之间的函数关系; (2)若再同一直角坐标系中,y 1 和y 2 没有交点,试确定两个常数的乘积k 1 k 2 的取值范围.
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