1) (a^m+b^n) ^2 2) (2x^m-3y^n) ^2 3) (a^n+1+1/2b^2) ^2 4) (5x^3-2y^n-1) ^2 5) (3a+b) ^2- (a-3b) ^2*2ab 6) (a^2+2a) ^2+(2a^-a) ^2)*5a^2

1) (a^m+b^n) ^2=a^2m+2a^mb^n+b^2n2) (2x^m-3y^n) ^2=4x^2m-12x^my^n+9y^2n3) (a^n+1+1/2b^2) ^2=a^2n+2+a^n+1b^2+1/4b^44) (5x^3-2y^n-1) ^2=25x^6-20x^3y^n-1+4y^2n-25) (3a+b) ^2- (a-3b) ^2*2ab6) (a^2+2a) ^2+(2a^ -a) ^2)*5a^2={a^4+4a^3+4a^2+4a^4-4a^3+a^2}*5a^2={5a^4+5a^2}*5a^2=5a^2 (a^2+1)*5a^2=25a^4 (a^2+1)=25a^6+25a^4