As shown in the figure, points a and B are on the straight line Mn, ab = 11cm, the radii of ⊙ A and ⊙ B are 1cm, and ⊙ a moves at a speed of 2cm per second As shown in the figure, points a and B are on the straight line Mn, ab = 11cm, and the radii of ⊙ A and ⊙ B are all 1cm. ⊙ a moves from left to right at the speed of 2cm per second. At the same time, the radius of ⊙ B is also increasing. The relationship between the radius R (CM) and time t (s) is r = 1 + T (t ≥ 0) (1) Try to write out the functional expression between the distance D (CM) between points a and B and the time t (s); (2) How many seconds after point a starts, the two circles are tangent?

(1)d=11-2t
(2) Circumscribe: when two circles circumscribe, ab = sum of radius of two circles, i.e
　　11-2t=1+1+t
t=3
Inscribed: when two circles are inscribed, ab = radius difference between two circles, i.e
　　11-2t=1+t-1
t=11/3

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