Question

-2/3-(-1/2), 2/5-4/5, -3/8-5/8решите пж, с объяснением

Answer 1

Ответ:

1) -2/3-(-1/2)= -2/3+1/2=-4/6+3/6=-(4/6-3/6)=-1/6

2) 2/5-4/5= -(4/5-2/5)=-2/5

3) -3/8-5/8=-(3/8+5/8)=-8/8=-1

Answer 2

To solve the given expressions, let's break them down step by step:

1. -2/3 - (-1/2): To subtract a negative number, we can change the operation to addition and change the sign of the number being subtracted. So, the expression becomes -2/3 + 1/2. To add fractions, we need a common denominator. The common denominator for 3 and 2 is 6. - Multiplying the numerator and denominator of -2/3 by 2, we get -4/6. - Multiplying the numerator and denominator of 1/2 by 3, we get 3/6. Now, the expression becomes -4/6 + 3/6. Subtracting the numerators, we get -1/6. Therefore, -2/3 - (-1/2) = -1/6.

2. 2/5 - 4/5: Since the denominators are the same, we can directly subtract the numerators. Subtracting 4/5 from 2/5, we get -2/5. Therefore, 2/5 - 4/5 = -2/5.

3. -3/8 - 5/8: Since the denominators are the same, we can directly subtract the numerators. Subtracting 5/8 from -3/8, we get -8/8. Simplifying -8/8, we get -1. Therefore, -3/8 - 5/8 = -1.

So, the solutions to the given expressions are: - -2/3 - (-1/2) = -1/6 - 2/5 - 4/5 = -2/5 - -3/8 - 5/8 = -1

Let me know if you have any further questions!