4/7 + 5/21 = 12/21 + 5/21 = 17/21
7/8 - 3/5 = 35/40 - 24 /40 = 11/40
5/9 + 7/12 = 20/36 + 21/36 = 41/36
2/5 * 8/9 = 16/45
15/8 * 12/25= 180/200 = 18/20 = 9/10
2/5 * 9/7 = 18/35
11* 5/6 = 55/6
7/2 +105/150= 525/150 + 105/150 = 630/150 = 63/15 =21/5
(21/6 + 15/6)*7/25
= 36/6 *7/25
= 6 *7/25
= 42/25
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4/7 + 5/21 = 12/21 + 5/21 = 17/21
7/8 - 3/5 = 35/40 - 24 /40 = 11/40
5/9 + 7/12 = 20/36 + 21/36 = 41/36
2/5 * 8/9 = 16/45
15/8 * 12/25= 180/200 = 18/20 = 9/10
2/5 * 9/7 = 18/35
11* 5/6 = 55/6
7/2 +105/150= 525/150 + 105/150 = 630/150 = 63/15 =21/5
(21/6 + 15/6)*7/25
= 36/6 *7/25
= 6 *7/25
= 42/25