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【简答题】
已知一次函数y= +m（0＜m≤1）的图象为直线l，直线l绕原点O旋转180°后得直线l′，△ABC三个顶点的坐标分别为A（- ，-1）、B（ ，-1）、C（0，2）。 （1）直线AC的解析式为________，直线l′的解析式为________ （可以含m）； （2）如图，l、l′分别与△ABC的两边交于E、F、G、H，当m在其范围内变化时，判断四边形EFGH中有哪些量不随m的变化而变化？并简要说明理由； （3）将（2）中四边形EFGH的面积记为S，试求m与S的关系式，并求S的变化范围； （4）若m=1，当△ABC分别沿直线y=x与y= x平移时，判断△ABC介于直线l，l′之间部分的面积是否改变？若不变请指出来，若改变请写出面积变化的范围。（不必说明理由）
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