Выполнить умножение 2 7/9*3 3/5, 3 7/9*1 1/17, 5 1/6*3 1/7, 7 1/3*2 2/11

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вопрос

2 7/9 3 3/5 = (2 + 7/9) (3 + 3/5)
= (18/9 + 7/9) (15/5 + 3/5)
= (25/9) (18/5)
= 450/45
= 10

3 7/9 1 1/17 = (3 + 7/9) (1 + 1/17)
= (27/9 + 7/9) (17/17 + 1/17)
= (34/9) (18/17)
= 612/153
= 4

5 1/6 3 1/7 = (5 + 1/6) (3 + 1/7)
= (30/6 + 1/6) (21/7 + 1/7)
= (31/6) (22/7)
= 682/42
= 16 1/21

7 1/3 2 2/11 = (7 + 1/3) (2 + 2/11)
= (21/3 + 1/3) (22/11 + 2/11)
= (22/3) (24/11)
= 528/33
= 16