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20 1 1 Tianjin College Entrance Examination Mathematics Text 19 Why should T be divided into (0, 1) and (1, 2)?
At this time, because: t>0, x∈(0, 1), the derivative function is zero at (0, +∞);

There are two possibilities for the monotonicity of the original function at (0, 1); So there are two situations:

( 1)t/2 & gt； 1;

(2)0 & lt； t/2 & lt； 1

Only according to monotonicity can the problem be clearly expressed.

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