[latex]1) \frac{4+m}{4-m}*( \frac{2m^2}{4+m}-m);2) (2+\frac{a}{a+1})* \frac{3a^2+3a}{12a+8};3)( \frac{a}{a-5}-2a)/ \frac{11-2a}{a-5} [/latex]

1) =[latex](2*m^2(4+m))/((4+m)*(4-m))-m*(4+m)/(4-m)= [/latex][latex]=2*m^2/(4-m) -m(4+m)/(4-m)=(m^2-4*m)/(4-m)=[/latex] 2)[latex]=(6*a^2+6*a)/(12*a+8)+(3*a^3+3*a^2)/((a+1)(12*a+8))=[/latex][latex]=(9a^2+6*a)/(12*a+8)[/latex] 3)[latex]=(a/(a-5)-2*a)/((a-5)/(11-2*a))=[/latex][latex]=(a-2*a^2+10*a)/(11-2*a)=a(11-2*a)/(11-2*a)=a[/latex]