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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 1 - No. 39)

Simplify: 9m + 4n - 5m - 2n
4m + 2n
14m + 6n
4m - 2n
14m - 6n

解释

9m - 5m + 4n - 2n = 4m + 2n

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