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Question: Is it caused by numeric error?

Question:Is it caused by numeric error?

chengran 8 Maple 13
solve numeric
July 21 2010
0

I want to fsolve one non-linear equation as follows: expr_1/expr_2=C which can not be solvable in maple directly. However, once I use expr_3=simplify(expr_1/expr_2) and then expr_3=C, it returns a result. Something weird happens now. Once I substitute the result in expr_3, it returns a value the same as C. But if I substitute the result in expr_1 and expr_2 respectively and then do a division, the outcome is dramatically different from C, which makes no sense at all. Is it some kind of numeric error? Is there some way to avoid it? Thank you. 
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