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(13+26)×1/13×1/26 =13×1/13×1/26+26×1/13×1/26 =1/26+1/13 =3/26 很高興為你解答,如果還有其他的問題請追問我. 171819sss隨時為你解答. 如果你感覺我的回答很好,請輕輕的點擊右下角的【採納為滿意回答】. 你的肯定是我最大的快樂. 教育科學團(土豆)為你解答.
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