надеюсь ты поймёшь. ещё 20 символов.
1)(r-5)(r+5)/(r+2)r(r+5)=
=r-5/r(r+2)
2)r-5/r(r+2)-r+5/r(r-2)=
=(r-5)(r-2)-(r+5)(r+2)/r(r+2)(r-2)=
=r2-2r-5r+10-r2-2r-5r-10/r(r+2)(r-2)=-14r/r(r+2)=-14/r2-4
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надеюсь ты поймёшь. ещё 20 символов.
1)(r-5)(r+5)/(r+2)r(r+5)=
=r-5/r(r+2)
2)r-5/r(r+2)-r+5/r(r-2)=
=(r-5)(r-2)-(r+5)(r+2)/r(r+2)(r-2)=
=r2-2r-5r+10-r2-2r-5r-10/r(r+2)(r-2)=-14r/r(r+2)=-14/r2-4