3)а)(3х+у)(2х-5у)-6(х-у)²=6х²-15ху+2ху-5у²-6(х²-2ху+у²)=
=6х²-15ху+2ху-5у²-6х²+12ху-6у²=-ху-11у²
б)(-2х³у)³*(-5х²у)²=(-2)³*(х³)³*у³*(-5)²*(х²)²*у²=
=-8х⁹у³*25х⁴у²=-400х¹³у⁵
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3)а)(3х+у)(2х-5у)-6(х-у)²=6х²-15ху+2ху-5у²-6(х²-2ху+у²)=
=6х²-15ху+2ху-5у²-6х²+12ху-6у²=-ху-11у²
б)(-2х³у)³*(-5х²у)²=(-2)³*(х³)³*у³*(-5)²*(х²)²*у²=
=-8х⁹у³*25х⁴у²=-400х¹³у⁵