第一题 5/6 -1/3 + 1/4 =5/6 - 2/6 + 1/4 =3/6 + 1/4 =1/2 + 1/4 =2/4 + 1/4 =3/4第二题 4/5 - (1/3 +5/12 ) = 4/5 - (4/12 + 5/12) =4/5 - 9/12 =4/5 - 3/4
第一题 5/6 -1/3 + 1/4 =5/6 - 2/6 + 1/4 =3/6 + 1/4 =1/2 + 1/4 =2/4 + 1/4 =3/4第二题 4/5 - (1/3 +5/12 ) = 4/5 - (4/12 + 5/12) =4/5 - 9/12 =4/5 - 3/4
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