直接写出得数:直接写出得数:① 1/2 + 1/3 = ② 2/5 - 1/6 = ③ 2/5 + 3/8 = ④ 1 - 7/8 = ⑤ 1/4 - 2/7 = ⑥ 3/5 + 2/9 = ⑦ 7/20 + 12/20= ⑧ 1 - 5/11 - 6/11= ⑨ 6 -(1/4 - 1/8)= ⑩ 2/13 + 2/7 + 11/13 =
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