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21×5/14等于多少

21×5/14 =(21×5)/14 =15/2

5/14+2/21 =15/42+4/42 =19/42

9/14-(5/21+5/14) =9/14-5/14-5/21 =4/14-5/21 =12/42-10/42 =2/42

等于:1/42

5/14+4/21 =15/42+8/42 =23/42 谢谢,请采纳

9/14-(5/21+5/14) =9/14-5/14-5/21 =2/7-5/21 =1/21

分数表示就可以

5/6×54/21=45/14 希望能帮到你,望采纳,谢谢 ^_^

14/5÷21/4×25/16 =14/5×4/21×25/16 =5/6

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