[tex]1)\\\\3x(5y-2x)-2x(y-2x) =13xy-2x^2 \\\\2)\\\\4a(2b+7a)-3b(-b-2a)=8ab+28a^2+3b^2+6ab=28a^2 + 14ab+3b^2\\\\3)\\\\2xy(7x-6-7y)=14x^2-12xy-14xy^2[/tex]
[tex]4)\\\\ 2x(7xy-6-y) =14x^2y-12x-2xy\\\\5)\\\\y(2x^2-6x-y) = 2x^2y-6xy-y^2\\\\6)\\\\ xy(7y-6-x) =7xy^2-6xy-x^2y[/tex]
