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A1= (x+2)x (piso)
A2 =(x+2)x (techo)
A3=(x+2)(2x+1) parede frente
A4=(x+2)(2x+1) parede atras
A5= (2x+1)x pared lateral izquierda
A6= (2x+1)x pared lateral derecha
Sumamos todo:
2(x+2)x+2(x+2)(2x+1)+2(2x+1)x
2x^2+4x+4x^2+10x+4+4x^2+2x
10x^2+16x+4 es lo que necesitas RPTA