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1.Given three points A(0,-4), B(-4,6) and C(-6,-2), R is a point on AB such that AR:RB=1:λ, where λ>0. (a)Find the coordinates of R in terms of λ. (b)If the area of triangle RAC is 8 square units, find the value(s) of λ.
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(a) 圖片參考：http://i117.photobucket.com/albums/o61/billy_hywung/Sep07/Crazycoord11.jpg
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