Математика: 5/6-3/4=?; 1/3 + 1/5=?; 3/10 + 1/2=?; 1/3--1/7 = ?; 9/20 + 3/8=?; 19/75 - 11/50=?; 13/50 - 17 / 75=?; 11/14 + 8/21=?

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Математика

29 мая, 20:56

Математика: 5/6-3/4=?; 1/3 + 1/5=?; 3/10 + 1/2=?; 1/3--1/7 = ?; 9/20 + 3/8=?; 19/75 - 11/50=?; 13/50 - 17 / 75=?; 11/14 + 8/21=?

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Полина Щербакова · Answer 1

5/6 - 3/4 = 10 / 12 - 9/12 = 3 / 12 = 1 / 4;

1/3 + 1/5 = 5 / 15 + 3/15 = 8/15;

3/10 + 1/2 = 3 / 10 + 5/10 = 8/10 = 4/5;

1/3 - (-1/7) = 7/21 - (-3/21) = 10/21; (если 1/3 - 1/7 = 7/21 - 3/21 = 4/21)

9/20 + 3/8 = 18/40 + 15/40 = 33/40;

19/75 - 11/50 = 38/150 - 33/150 = 5/150 = 1 / 30;

13/50 - 17 / 75 = 36/150 - 34/150 = 3/150 = 1/50;

11/14 + 8/21 = 33/42 + 16/42 = 39/42.