5/12 +(6/7 +6/21)等于几分之几脱式计算?
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5/12+(6/7+6/21)
=5/12+18/21+6/21
=5/12+24/21
=5/12+8/7
=35/84+96/84
=131/84
=5/12+18/21+6/21
=5/12+24/21
=5/12+8/7
=35/84+96/84
=131/84
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5/12+(6/7+6/21) =5/12+18/21+6/21 =5/12+24/21 =5/12+8/7 =35/84+96/84 =131/84
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