結果 : negative plus negative equals positive examples
2:01

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Stand and Deliver - A Negative Times A Negative Equals A Positive

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A Demonstration of - Two Negatives Make a Positive

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Why a negative times a negative is a positive | Pre-Algebra | Khan Academy

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Illustrating Why a Negative Times a Negative is a Positive Using the Number Line!

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how does a negative times a negative equal a positive? #math #simplify

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Why Does Multiplying 2 Negative Numbers Make a Positive Number

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