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並前往https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-negative-numbers-add-and-subtract/cc-7th-sub-neg-intro/a/subtracting-negative-numbers-review

Subtracting negative numbers review (article) | Khan Academy

Review the basic of subtracting negative numbers and try some practice problems. Google Classroom Facebook Twitter. Email. Intro to subtracting ...

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