Respuesta:
Espero te sirva
Explicación paso a paso:
1)[tex](x+2y)^{2} -(x-2y)^{2} -4xy[/tex]
[tex]x^{2} +4xy+4y^{2}[/tex][tex]-(x-2y)^{2} -4xy[/tex]
[tex]x^{2} +4xy+4y^{2} -x^{2} +4xy-4xy[/tex]
4xy
3) [tex](1 +\sqrt{5})(\sqrt{5}-1)+(1+\sqrt{3})(\sqrt{3}-1)[/tex]
[tex]\frac{6}{1}[/tex]
Sale 6
4) [tex]x^{2} +3x+2+(x+3)(x+4)2x(x+5)[/tex]
[tex]x^{2} +3x+2+x^{2} +7x+12-2(x+5)[/tex]
[tex]x^{2} +3x+2+x^{2} +7x+12-2x^{2} +10[/tex]
Simplicamos y sale 10
