Question

Виконай дії:
1) 7/12 + 5/8 =?
2) 2 13/15 + 1 1/5 =?
3) 7/10 - 3/8 =?
4) 3 5/12 - 1 3/4 =?

Answer 1

1)7/12 + 5/8 = (7*8 + 5*12) / (12*8) = 56/96 = 7/12
2)2 13/15 + 1 1/5 = (2 * 15 + 13) / 15 + (1 * 5 + 1) / 5 = 43/15 + 6/5 = (43*5 + 6*15) / (15*5) = 215/75 + 90/75 = (215 + 90) / 75 = 305/75 = 61/15
3)7/10 - 3/8 = (7*8 - 3*10) / (10*8) = 18/80 = 9/40
4)3 5/12 - 1 3/4 = (3 * 12 + 5) / 12 - (1 * 4 + 3) / 4 = 41/12 - 7/4 = (41*4 - 7*12) / (12*4) = 164/48 - 84/48 = (164 - 84) / 48 = 80/48 = 5/3

Answer 2

Відповідь:

7/12 + 5/8 = 1 5/24

2 13/15 + 1 1/5 = 1 1/15

7/10 - 3/8 = 13/40

3 5/12 - 1 3/4 = 1 2/3

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