Решите пж, по действиям!6 класс математика

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(1/2-1/3)-(1/4-1/5)=(3/6-2/6)-(5/20-4/20)= 1/6 - 1/20 = 10/60 - 3/60 = 7/60

3 2/9 + 4 1/6 - 1 8/27 = 3 12/54 + 4 9/54 - 1 16/54= 7 21/54 - 1 16/54 = 6 5/54

11 - 6 2/3 - 3 5/7 = 11 - (6 2/3 + 3 5/7) = 11 - (6 14/21 + 3 15/21) = 11 - 10 8/21 = 13/21

27/75 + 32/100 - 7/15 = 108/300 + 96/300 - 140/300 = 204/300 - 140/300 = 64/300 = 16/75

(1/3 - 1/4) - (1/5 - 1/6) = (4/12 - 3/12) - (6/30 - 5/30) = 1/12 - 1/30 = 5/60 - 2/60 = 3/60 = 1/20

5 7/12 - 2 4/9 + 1 5/18 = 5 63/108 - 2 48/108 + 1 30/108 = 3 15/108 + 1 30/108 = 4 45/108 = 4 5/12

10 - 3 4/5 - 5 2/3 = 10 - (3 4/5 + 5 2/3) = 10 - (3 12/15 + 5 10/15) = 10 - 9 7/15 = 8/15

3/4 * 8/9 = 1 * 2/3 = 2/3

1 7/8 * 4/10 = 15/8 * 4/10 = 3/2 * 1/2 = 3/4

1 1/3 * 3/7 + 4/7 * 1 1/3 = 4/3 * 3/7 + 4/7 * 4/3 = 4 * 1/7 + 4/7 * 4/3 = 4/7 + 16/21 = 12/21 + 16/21 = 28/21 = 1 7/21 = 1 1/3

5/7 * 21/25 = 1 * 3/5 = 3/5

2 1/12 * 8/10 = 25/12 * 8/10 = 5/3 * 1 = 5/3 = 1 2/3

2 1/4 * 7/9 + 2/9 * 2 1/4 = 9/4 * 7/9 + 2/9 * 9/4 = 1/4 * 7 + 1 * 1/2 = 7/4 + 1/2 = 7/4 + 2/4 = 9/4 = 2 1/4