Parenthesis are your friend when in doubt use them :)
10x^2+9x/5x^2+3x
is not the same as
(10x^2+9x)/(5x^2+3x)
People should use http://www.wolframalpha.com/
to show you in how humans view it and see difference. We call it pretty print.
Anyone else know similar sites like wolfram? I heard of http://www.numberempire.com/ is good too.

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wolfram do good software. i have heard lots of good things about "mathmatica"

mathmatica is wolframs software or a different one?

it is wolframs

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