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t1-α/2和tα/2
△t=t1+t2/2
(t1+t2)/2
t1-α=-tα
t1/2α t1/2β
t1/2γ
△t-t1+t2
t1/2z
t1+t2等于0
t1/2e-t
δ(t-t1)*δ(t-t2)
t1/2=0.693
t1/2的意义
t1/2f
t1+t2=0的意义
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