1. Given that two circles x square + y square = 10 and (x-1) square + (Y-3) square = 20 intersect at two points a and B, then the equation of line ab_______ ? 2. The two points P and Q on the circle x + square y + square x-6y + 3 = 0 originate from the symmetry of the straight line kx-y + 4 = 0, then K=__ ? 3. The equation of circle with the diameter of the line segment between the two coordinate axes of the line 3x-4y + 12 = 0_____ ?

1. Given that two circles x square + y square = 10 and (x-1) square + (Y-3) square = 20 intersect at two points a and B, then the equation of line ab_______ ? 2. The two points P and Q on the circle x + square y + square x-6y + 3 = 0 originate from the symmetry of the straight line kx-y + 4 = 0, then K=__ ? 3. The equation of circle with the diameter of the line segment between the two coordinate axes of the line 3x-4y + 12 = 0_____ ?

The first problem is: X & sup2; + Y & sup2; - 10 = 0 X & sup2; + Y & sup2; - 2x-6y-10 = 0 minus 2x + 6y = 0 x + 3Y = 0 the second problem is: ^ 2 is the square, and √ is the root. First, transform the curve equation to: (x + 1 / 2) ^ 2 + (Y-3) ^ 2 = (5 / 2) ^ 2. This is a circle, then PQ is on the circle, PQ is symmetric about the straight line, then