1)
AB= 12+X
BC=3+X
AB-BC=(12+X)-(3+X)
AB-BC= 12+X-3-X
AB-BC= 9
2)
P2=AB
2P2=BC
P2+2P2=30
3P2=30
P2=30/3
P2=10
ENTONCES
2P2=2(10) =20
2P2=BC=20
3)AC-BC
=30-20= 10
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1)
AB= 12+X
BC=3+X
AB-BC=(12+X)-(3+X)
AB-BC= 12+X-3-X
AB-BC= 9
2)
P2=AB
2P2=BC
P2+2P2=30
3P2=30
P2=30/3
P2=10
ENTONCES
2P2=2(10) =20
2P2=BC=20
3)AC-BC
=30-20= 10