10怎樣列式02解決含有未知數的加減算式(是非01)

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10怎樣列式02解決含有未知數的加減算式(是非01)

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(1) 「媽媽做了x個布丁，吃掉5個，還剩下13個，媽媽做了幾個布丁？」可以列出算式：x－5＝13

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(2) x加上75等於100，x＝100＋75。

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