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Several mathematical problems were solved at the beginning of ascent and connection.
This is decomposable.

x？ +2x+ 1-a？ ≤0

(x+ 1-a)(x+ 1+a)≤0

Then we can discuss the positive and negative of a (that is, compare the sizes of 1-a and 1+a).

a & lt0 a- 1

X=0 when a=0.

a & gt0-a- 1

x？ -( 1+a)x+a

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