Question

Как решиить задачу 3 способами: в рулоне было 30 метров ткани. от него отрезали два куска длиной 7 и 9 метров. сколько ткани осталось в рулоне . ришить с крадкой запесю.

Answer 1

1) 30-7=23 (м)- после первого отреза.
2) 23-9=14 (м)
2 решение
1) 30-(7+3)=14 (м)
3 решение
1) (30-7)+(30-3)=14 (м)

Answer 2

Solving the Problem

To solve the problem of finding out how much fabric is left on the roll after cutting two pieces of 7 and 9 meters, we can use three different methods.

1. Subtraction Method: We can find the remaining fabric on the roll by subtracting the total length of the cut pieces from the initial length of the roll. - Initial length of the roll: 30 meters - Length of the first cut: 7 meters - Length of the second cut: 9 meters - Remaining fabric = Initial length - Length of first cut - Length of second cut - Remaining fabric = 30 - 7 - 9 = 14 meters.

2. Addition and Subtraction Method: Another way to solve this problem is by adding the lengths of the cut pieces and then subtracting the total from the initial length of the roll. - Initial length of the roll: 30 meters - Length of the first cut: 7 meters - Length of the second cut: 9 meters - Total length of the cut pieces = 7 + 9 = 16 meters - Remaining fabric = Initial length - Total length of cut pieces - Remaining fabric = 30 - 16 = 14 meters.

3. Using Multiplication and Division: We can also solve this problem using multiplication and division. - Initial length of the roll: 30 meters - Length of the first cut: 7 meters - Length of the second cut: 9 meters - Total length of the cut pieces = 7 + 9 = 16 meters - Remaining fabric = Initial length - (Total length of cut pieces) - Remaining fabric = 30 - (7 + 9) = 30 - 16 = 14 meters.

Conclusion

After using all three methods, we find that the remaining fabric on the roll is 14 meters.