Номер 1.
а) 3/4 + 2/3 = 9/12 + 8/12 = 17/12 = 1 5/12
b) 7 5/12 + 4 3/8 = 7 10/24 + 4 9/24 = 11 19/24
Номер 2.
а) 6/7 - 2/3 = 18/21 - 14/21 = 4/21
b) 3 7/15 - 1 3/10 = 3 14/30 - 1 9/30 = 2 5/30 = 2 1/6
Номер 3.
а) 3/7 * 2/5 = 6/35
b) 3 1/9 * 2 1/7 = 28/9 * 15/7 = 20/3 = 6 2/3
Номер 4.
а) 3/4 : 5/8 = 3/4 * 8/5 = 6/5 = 1,2
b) 1 5/7 : 1 1/7 = 12/7 : 8/7 = 12/7 * 7/8 = 3/2 = 1,5
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Answers & Comments
Номер 1.
а) 3/4 + 2/3 = 9/12 + 8/12 = 17/12 = 1 5/12
b) 7 5/12 + 4 3/8 = 7 10/24 + 4 9/24 = 11 19/24
Номер 2.
а) 6/7 - 2/3 = 18/21 - 14/21 = 4/21
b) 3 7/15 - 1 3/10 = 3 14/30 - 1 9/30 = 2 5/30 = 2 1/6
Номер 3.
а) 3/7 * 2/5 = 6/35
b) 3 1/9 * 2 1/7 = 28/9 * 15/7 = 20/3 = 6 2/3
Номер 4.
а) 3/4 : 5/8 = 3/4 * 8/5 = 6/5 = 1,2
b) 1 5/7 : 1 1/7 = 12/7 : 8/7 = 12/7 * 7/8 = 3/2 = 1,5