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OpenStudy (anonymous):
Am i right? I chose A. Which property would be useful in proving that the product of two rational numbers is ALWAYS rational? A) a/b+ c/d= ad + bc/bd B) a + b/cd= a/cd+ b/cd C) a/b· c/d= ac/bd D) a/b÷ c/d=a/b· d/c
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