Question

A) 1/3-2/5 b) 1/5+2/7 c) 3/45-1/27 срочно пожалуйста

Answer 1

A) 1/3-2/5=1*5/15 - 2*3/15=(5-6)/15=-1/15

b) 1/5+2/7= 1*7/35 + 2*5/35=(7+10)/35=17/35

c) 3/45-1/27=3*3/(45*3) - 1*5/(27*5)= (9-5)/135=4/135

Answer 2

A) To subtract fractions, you need a common denominator. The common denominator for 3 and 5 is 15. So, let's convert the fractions:

1/3 = (1/3) * (5/5) = 5/15 2/5 = (2/5) * (3/3) = 6/15

Now, subtract the fractions:

5/15 - 6/15 = (5 - 6)/15 = -1/15

Therefore, the answer is -1/15.

B) To add fractions, you also need a common denominator. The common denominator for 5 and 7 is 35. So, let's convert the fractions:

1/5 = (1/5) * (7/7) = 7/35 2/7 = (2/7) * (5/5) = 10/35

Now, add the fractions:

7/35 + 10/35 = (7 + 10)/35 = 17/35

Therefore, the answer is 17/35.

C) To subtract fractions, you need a common denominator. The common denominator for 45 and 27 is 135. So, let's convert the fractions:

3/45 = (3/45) * (3/3) = 9/135 1/27 = (1/27) * (5/5) = 5/135

Now, subtract the fractions:

9/135 - 5/135 = (9 - 5)/135 = 4/135

Therefore, the answer is 4/135.

Final answers: A) -1/15 B) 17/35 C) 4/135