1.

e abscissa of the orthocentre of thetriangle formed by the lines y=m_{1} x+\frac{b}{m_{1}}y=m_{2} x+\frac{b}{m_{2}}, \quad y=m_{3} x+\frac{b}{m_{3}}1) b2) -b3) 2b4) -2b

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1

2

the answer is -b



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