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h=4b
2h+2b=120
sustituimos en la segunda ecuacion h=4b
2h+2b=120
2(4b)+2b=120
8b+2b=120
10b=120
b=120/10
b=12
si b=12..........h=4b....h=4(12).......h=48
b=12 h=48
respuesta: la base mide 12 cm.....y la altura mide 48 cm
10 x es igual a 120
x es igual a 120/10
x es igual a 12
base es igual a 12
altura es igual a 48