[tex]1)\\\\5(-3z+12y-4)=-15z+60y-20\\\\2)\\\\-20x^2(5x+2y-7z)=-100x^3-40x^2y+140x^2z\\\\3)\\\\-2a(- \frac{1}{2}+3a)=a-6a^2\\\\4)\\\\6xy(-2x+4y-7 )=-12x^2y+24xy^2-42xy[/tex]
[tex]5)\\\\ m(-4m+3n-2)= -4m^2+3mn-2m \\\\6)\\\\ \frac{2}{3}(6a-12b+9)=4a-8b+6\\\\7)\\\\(-5x+7y-2z)*(-2)=10x-14y+4z\\\\8)\\\\ab(-10a+20b-35)=-10a^2b+20ab^2-35ab[/tex]
