Question

Вычеслите,используя знаконы сложение : а)1/5+8/25+7/25=? б)1/7+2/21+3/7=? в)1/15+2\45+7/15=? г)3/49+5/7+4/49=? д)7/10+2\15+11/30=? е)1/12+1/18+1/12=? если что вот это дроби очень надо помогите пожалуйста)))

Answer 1

50 будет в а б 809 в 900 г800

Answer 2

а) To add fractions, you need to have a common denominator. In this case, the common denominator is 25. Let's calculate:

1/5 + 8/25 + 7/25 = (5/5) * (1/5) + (1/1) * (8/25) + (1/1) * (7/25) = 5/25 + 8/25 + 7/25 = (5 + 8 + 7)/25 = 20/25 = 4/5.

б) Again, we need a common denominator, which is 21 in this case. Let's calculate:

1/7 + 2/21 + 3/7 = (3/3) * (1/7) + (1/1) * (2/21) + (1/1) * (3/7) = 3/21 + 2/21 + 9/21 = (3 + 2 + 9)/21 = 14/21 = 2/3.

в) The common denominator here is 45. Let's calculate:

1/15 + 2/45 + 7/15 = (3/3) * (1/15) + (1/3) * (2/45) + (3/3) * (7/15) = 3/45 + 2/45 + 21/45 = (3 + 2 + 21)/45 = 26/45.

г) The common denominator here is 49. Let's calculate:

3/49 + 5/7 + 4/49 = (1/1) * (3/49) + (7/7) * (5/7) + (1/1) * (4/49) = 3/49 + 35/49 + 4/49 = (3 + 35 + 4)/49 = 42/49 = 6/7.

д) The common denominator here is 30. Let's calculate:

7/10 + 2/15 + 11/30 = (3/3) * (7/10) + (2/2) * (2/15) + (1/1) * (11/30) = 21/30 + 4/30 + 11/30 = (21 + 4 + 11)/30 = 36/30 = 6/5.

е) The common denominator here is 36. Let's calculate:

1/12 + 1/18 + 1/12 = (3/3) * (1/12) + (2/2) * (1/18) + (3/3) * (1/12) = 3/36 + 2/36 + 3/36 = (3 + 2 + 3)/36 = 8/36 = 2/9.

I hope this helps! Let me know if you have any further questions.