In the arithmetic sequence {an}, it is known that A1 > 0, Sn is the sum of the first n terms of the sequence, if S9 > 0, S10

The method of filling in the blanks is introduced here,
According to the quadratic function image, if S9 is greater than 0, then 4.5 is slightly left of the axis of symmetry, and if S10 is less than 0, it is 5.5
Which is closer to the axis of symmetry, 4 or 5? Because 4.5 is on its left, the axis of symmetry is closer to 5

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