1 Answers
(4-81x2)/(9x4-2x3)
={(2+9x)(2-9x)}/{x3(9x-2)}
={-(2+9x)(2-9x)}/{x3(2-9x)}
=-(9x+2)/x3
={(2+9x)(2-9x)}/{x3(9x-2)}
={-(2+9x)(2-9x)}/{x3(2-9x)}
=-(9x+2)/x3
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