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A. 18.fi B. 54.fi c. to8Ji D. 216JJ 1 -
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1. riii W. ¥t .iDifH1<:J Jik
A. (x+l)(x-1) = x 2 Ho-~-=1~;J~
B. 1Hi 3x2 = 6x 1¥Jffllt:;lg x = 2
c. :1:r:xf x 1¥J-~=1~1J~ 1a2 -2x-1 = o 1'fWi1-::fffl~gg~~~. JJ!U k > -1
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C. 7rx52 x=nx62 x(x+5) D. ,rx82x=,i:X62X5
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