Odpowiedź:
[tex]-6n(5-2n)+5n(n+3)=-30n+12n^2+5n^2+15n=17n^2-15n\\\\3a(b-5)+2b(3a+5)=3ab-15a+6ab+10b=9ab-15a+10b\\\\2u(1-v)+v(3u+4)=2u-2uv+3uv+4v=2u+uv+4v\\\\m(2m-n)-2n(4-m)=2m^2-mn-8n+2mn=2m^2+mn-8n\\\\-x(2x+y)+4y(x-2y)=-2x^2-xy+4xy-8y^2=-2x^2+3xy-8y^2[/tex]
