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5分之4加9分之7减(5分之1加9分之7) = 4/5 + 7/9 - 1/5 - 7/9 = 4/5 - 1/5 +(7/9 -7/9) = 3/5 【秋風燕燕為您答題】 有什麼不明白可以對該題繼續追問 請及時選為滿意答案,
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