Question

Помогите пж!!!! Выполните действия: a)2/3+4/5;б)2(целых) 3/8+1(целая) 3/4;в)4/7-3/14;г)3(целых)-1(целая) 7/9 ----помогите пж!--------

Answer 1

А)10/15+12/15=22/15= 1целая 7/15 б) 2(цел)3/8 +1(цел)3/4=33/8= 4(цел) 1/9 в)9/12 г) 1цел 2/9

Answer 2

Solution:

a) To add fractions, we need to find a common denominator. The common denominator for 3 and 5 is 15.

So, we have:

2/3 + 4/5 = (2 * 5)/(3 * 5) + (4 * 3)/(5 * 3) = 10/15 + 12/15 = (10 + 12)/15 = 22/15.

Therefore, 2/3 + 4/5 = 22/15.

b) To add mixed numbers, we first need to convert them to improper fractions.

2(целых) = 2 * 1 = 2.

1(целая) = 1 * 1 = 1.

So, we have:

2(целых) + 3/8 + 1(целая) + 3/4 = 2 + 3/8 + 1 + 3/4.

To add fractions with different denominators, we need to find a common denominator. The common denominator for 8 and 4 is 8.

So, we have:

2 + 3/8 + 1 + 3/4 = 2 + (3 * 1)/(8 * 1) + 1 + (3 * 2)/(4 * 2) = 2 + 3/8 + 1 + 6/8 = 2 + 3/8 + 1 + 6/8 = (2 * 8 + 3 + 1 * 8 + 6)/8 = (16 + 3 + 8 + 6)/8 = 33/8.

Therefore, 2(целых) + 3/8 + 1(целая) + 3/4 = 33/8.

c) To subtract fractions, we need to find a common denominator. The common denominator for 7 and 14 is 14.

So, we have:

4/7 - 3/14 = (4 * 2)/(7 * 2) - (3 * 1)/(14 * 1) = 8/14 - 3/14 = (8 - 3)/14 = 5/14.

Therefore, 4/7 - 3/14 = 5/14.

d) To subtract mixed numbers, we first need to convert them to improper fractions.

3(целых) = 3 * 1 = 3.

1(целая) = 1 * 1 = 1.

So, we have:

3(целых) - 1(целая) + 7/9 = 3 - 1 + 7/9.

To subtract fractions with different denominators, we need to find a common denominator. The common denominator for 9 is 9.

So, we have:

3 - 1 + 7/9 = 3 - 1 + (7 * 1)/(9 * 1) = 3 - 1 + 7/9 = (3 * 9 - 1 * 9 + 7)/9 = (27 - 9 + 7)/9 = 25/9.

Therefore, 3(целых) - 1(целая) + 7/9 = 25/9.