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God, please help me! The combination of mathematical functions in grade three!
Solution: Quadratic function Y=- 1/2X? +X-2/3

=- 1/2(X? -2X+ 1)+ 1/2-2/3

=- 1/2(X- 1)? - 1/6,

Vertex coordinates (1,-1/6) are in the fourth quadrant.

Open down,

∴ The parabola does not pass through the first quadrant,

The intersection point c of the first quadrant does not exist.