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A math problem in the 2008 Shanghai college entrance examination! Math experts give full play to your strengths and help me!
From the meaning of the question: 2 TF (2t)+MF (t) = 2 t, so the absolute value can be removed.
2 t means 2 t-2 (-t) > 0.
So: m> = 2 t [2 2t-2 (-2t)]/[2 t-2 (-t)]
M> =-2 (2t)-1
So when t= 1, meet the requirements of the topic, that is, m & gt=-5.