Question

Выполните действия: 1) (7/8-13/20)+9/10 2) (7/18-1/12)+5/6 3) (3/4-8/15)+17/20

Answer 1

1) (7/8-13/20)+9/10=35/40-26/40+36/40=71/40-26/40=45/40=9/8=1.125 или 1 целая 1/8
2) (7/18-1/12)+5/6=14/36-3/36+30/36=11/36+30/36=41/36=1 целая 5/36
3) (3/4-8/15)+17/20=45/60-32/60+51/60=64/60=16/15=1 целая 1/15

Answer 2

1) (7/8 - 13/20) + 9/10 First, find a common denominator for the fractions: 8 and 20 both divide evenly into 40. (7/8 - 13/20) = (35/40 - 26/40) = 9/40 Now add 9/10 to 9/40: (9/40 + 9/10) = (9/40 + 36/40) = 45/40 = 1 5/8

2) (7/18 - 1/12) + 5/6 First, find a common denominator for the fractions: 18 and 12 both divide evenly into 36. (7/18 - 1/12) = (14/36 - 3/36) = 11/36 Now add 5/6 to 11/36: (11/36 + 30/36) = 41/36 = 1 5/36

3) (3/4 - 8/15) + 17/20 First, find a common denominator for the fractions: 4 and 15 both divide evenly into 60. (3/4 - 8/15) = (45/60 - 32/60) = 13/60 Now add 17/20 to 13/60: (13/60 + 51/60) = 64/60 = 1 4/60 = 1 2/15

So, the final answers are: 1) 1 5/8 2) 1 5/36 3) 1 2/15