x^2-4y^2/18y-9x=(х+2у)(х-2у)/9(2у-х)=(х+2у)(х-2у)/-9(х-2у)=х+2у/-9
В конце сократили.
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x^2-4y^2/18y-9x=(х+2у)(х-2у)/9(2у-х)=(х+2у)(х-2у)/-9(х-2у)=х+2у/-9
В конце сократили.