<span> (3x+xy^2-x^2y-3y)/(y^2-x^2)</span>
<span>
</span>
<span>3(х-у)-ху(х-у) (х-у)(3-ху) 3-ху</span>
<span>------------------ = --------------- = ---------</span>
<span> (х-у)(х+у) (х-у)(х+у) х+у </span>
Ответ:
2(х+1^2-(х-3)(х+3)=7+х^2
2(х^2+2х+1)-(х^2-6х+1)=7+х^2
Х^2+4х+2-х^2+6х-9=7+х^2
Х^2+10х-7=7+х^2
10х-7=7
10=7+7
10=14
Х=7:5 _ деление
4n-m-3m+n=(4n+n)-(3m-m)=5n-2m