A:of
B:for
C:about
点M与点F(4,0)的距离比它到直线l:x+5=0的距离小1,则点M的轨迹方程是____
(1)解方程:3+x4-x=12;
(2)解不等式组:3x-1≥x+12(2x-1)<5x+1
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