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如果过点（0，1）斜率为k的直线l与圆x 2 +y 2 +kx+my-4=0交于M、N两点，且M、N关于直线x+y=0对称，那么直线l的斜率k=______；不等式组 kx-y+1≥0 kx-my≤0 y≥0 表示的平面区域的面积是______．
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