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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

21×5/14×1/20 =3×5/2×1/20 =3×1/2×1/4 =3/8

1/2-5/14 =7/14-5/14 =2/14 =1/7

5/14×21 =5/2×3 =15/2 (或7又1/2)。

9/14-(5/21+5/14) =9/14-5/21-5/14 =9/14-5/14-5/21 =4/14-5/21 =2/7-5/21 =6/21-5/21 =1/21

等于:1/42

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

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