Question

Коля начертил в тетради 5 отрезков, причем, каждый следующий отрезок он чертил длиннее предыдущего на 2 см. Длина последнего отрезка 15 см. Какой длины был первый отрезок

Answer 1

5-й отрезок=15 см
4-й отрезок=13см
3-й отрезок=11см
2-ой отрезок=9см
1-ый отрезок равен 7см

Answer 2

Problem Analysis

Kolya drew 5 segments in his notebook, with each subsequent segment being 2 cm longer than the previous one. The length of the last segment is given as 15 cm. We need to determine the length of the first segment.

Solution

Let's assume the length of the first segment is x cm. Since each subsequent segment is 2 cm longer than the previous one, we can set up the following equation:

x + (x + 2) + (x + 4) + (x + 6) + (x + 8) = 15

Simplifying the equation, we get:

5x + 20 = 15

Subtracting 20 from both sides, we have:

5x = -5

Dividing both sides by 5, we find:

x = -1

However, the length of a segment cannot be negative. Therefore, there seems to be an error in the given information or the problem statement. Please double-check the values provided.

Conclusion

Based on the given information, it is not possible to determine the length of the first segment accurately.