说明:结果都用最简代分数或整数表示 1, 10(5 − 1 ) 2 2, 1 12 − 3 3, 3 20(3 − 4 ) 8 , 3 40(5 − ) 4 5, 7 12 − 8 6, 4 15 − 9 7, 5 30(3 − ) 6 8, 5 26(10 − ) 13 9, 2 18 − 7 10, 14(3 − 5 7 )
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