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lado2= x + 1
lado3= x + 2
perímetro= lado1* lado2*lado3
12 cm= x +(x+1)+( x+2)
12 cm= x +x+1+ x+2
12 cm= 3x +3
12 -3=3x
9=3x
9/3=x
3=x
Rta.
lado1= 3cm
lado2= 4cm
lado3= 5cm