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Continue to ChatSumar o restar? Millor multiplicar https://blogs.avui.cat/jaumepubill/2011/03/05/sumar-o-restar-millor-multiplicar/
Sumar o restar? Millor multiplicar https://blogs.avui.cat/jaumepubill/2011/03/05/sumar-o-restar-millor-multiplicar/