Question

1/2 + 3/4
1/3 + 7/9
5/6 + 1 1/4
1 3/5 + 2 4/15
2 1/4 + 1 2/3
1 5/6 + 7/9
----------------
1/2 - 1/4
5/6 - 2/3
3/4 - 3/8
3 5/9 - 1/6
1 3/4 - 5/6
2 1/9 - 1 5/6

Answer 1

Odpowiedź:

Musisz sprowadzić do wspólnego mianownika

1/2 + 3/4 = 2/4 + 3/4 = 5/4 = 1 ¼

1/3 + 7/9 = 3/9 + 7/9 = 10/9 = 1 1/9

5/6 + 1 1/4 = 5/6 + 5/4 = 20/24 + 30/24 = 50/24 = 2 2/24

2 1/4 + 1 2/3 = 9/4 + 5/3 = 27/12 + 20/12 = 47/12 = 3 11/12

1 ⅚ + 7/9 = 11/6 + 7/9 = 33/18 + 17/18 = 50/18 = 2 14/18 = 2 7/9

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½ - ¼ = 2/4 - ¼ = ¼

⅚ - ⅔ = ⅚ - 4/6 = ⅙

¾ - ⅜ = 6/8 - ⅜ = 3/8

3 5/9 - ⅙ = 32/9 - ⅙ = 64/18 - 3/18 = 61/18 = 3 7/18

1 ¾ - ⅚ = 7/4 - ⅚ = 21/12 - 10/12 = 11/12

2 1/9 - 1⅚ = 19/9 - 11/6 = 38/18 - 33/18 = 5/18

Answer 2

Odpowiedź:

1/2 + 3/4 = 2/4 + 3/4 = 5/4 = 1 1/4

1/3 + 7/9 = 3/9 + 7/9 = 10/9 = 1 1/9

5/6 + 1 1/4 = 5/6 + 5/4 = 20/24 + 30/24 = 50/24 = 2 2/24

2 1/4 + 1 2/3 = 9/4 + 5/3 = 27/12 + 20/12 = 47/12 = 3 11/12

1 5/6 + 7/9 = 11/6 + 7/9 = 33/18 + 17/18 = 50/18 = 2 14/18 = 2 7/9

==================================

1/2 - 1/4 = 2/4 - 1/4= 1/4

5/6- 2/3 = 5/6- 4/6 = 1/6

3/4 - 3/8= 6/8 - 3/8 = 3/8

3 5/9 - 1/6 = 32/9 - 1/6 = 64/18 - 3/18 = 61/18 = 3 7/18

1 3/4- 5/6 = 7/4 - 5/6 = 21/12 - 10/12 = 11/12

2 1/9 - 1 1/6 = 19/9 - 11/6 = 38/18 - 33/18 = 5/18

Szczegółowe wyjaśnienie:

Aby odjąć lub dodać ułamki o różnych mianownikach trzeba je najpierw sprowadzić do wspólnego mianownika