Question

помогите АТО мнея съедят​

Answer 1

Ответ:

Пошаговое объяснение:

а) 7/13 + 1/13 = 8/13

б) 3/10 + 1/7 = 21/70 + 10/70 = 31/70

в) 9/25 + 2/5 = 9/25 + 10/25 = 19/25

д) 5/7 - 2/7 = 3/7

е) 7/9 - 1/4 = 28/36 - 9/36 = 19/36

ж) 7/8 - 5/7 = 49/56 - 40/56 = 9/56

а) 1/18 + (5/18 + 1/3) =

1/18 + (5/18 + 6/18) =

1/18 + 11/18 = 12/18 = 2/3

б) = (4/15 + 1/15) + (7/24 + 5/24) =

5/15 + 12/24 = 1/3 + 2/4 =

4/12 + 6/12 = 10/12 = 5/6

Answer 2

Ответ:

а)  8/13

б)  31/70

в)  19/25

д)  3/7

е)  19/36

ж)  9/56

а)  2/3

б)  5/6

Пошаговое объяснение:

а) 7/13 + 1/13 = 8/13

б) 3/10 + 1/7 = 3*7/10*7 + 1*10/7*10 = 21/70 + 10/70 = 31/70

в) 9/25 + 2/5 = 9/25 + 2*5/5*5 = 9/25 + 10/25 = 19/25

д) 5/7 - 2/7 = 3/7

е) 7/9 - 1/4 = 7*4/36 - 1*9/36 = 28/36 - 9/36 = 19/36

ж) 7/8 - 5/7 = 7*7/8*7 - 5*8/7*8 = 49/56 - 40/56 = 9/56

а) 1/18+(5/18+1/3) = 1/18+5/18+1/3 = 6/18+1/3 = 1/3+1/3 = 2/3

б) 4/15 + 7/24 + 5/24 + 1/15 = 4/15+1/15+7/24+5/24 = 5/15+12/24 = 1/3+1/2 =1*2/3*2+1*3/2*3 = 2/6+3/6 = 5/6