Question

РЕШИТЬ РАЗНЫМИ СПОСОБАМИ.Когда от бревна длиной 15 м. отпилили несколько метров,осталось ещё 6 м.Сколько метров бревна отпилили?РЕШИТЬ РАЗНЫМИ СПОСОБАМИ.

Answer 1

1 ) 15 - 6 = 9 м отпилили
2)  х + 6 = 15
      х = 15 - 6
      х = 9 м отпилили

Answer 2

Problem Analysis

We are given a log that is initially 15 meters long. After cutting off some meters, there are 6 meters remaining. We need to determine how many meters were cut off.

Solution 1: Subtraction

One way to solve this problem is by subtracting the length of the remaining log from the initial length of the log.

Let's denote the length of the cut-off portion as x. We can set up the equation:

15 - x = 6

To find the value of x, we can rearrange the equation:

x = 15 - 6

Simplifying the equation, we get:

x = 9

Therefore, 9 meters of the log were cut off.

Solution 2: Addition and Subtraction

Another way to solve this problem is by adding the length of the remaining log to the length of the cut-off portion.

Let's denote the length of the cut-off portion as y. We can set up the equation:

y + 6 = 15

To find the value of y, we can rearrange the equation:

y = 15 - 6

Simplifying the equation, we get:

y = 9

Therefore, 9 meters of the log were cut off.

Solution 3: Using the Difference

We can also solve this problem by finding the difference between the initial length of the log and the length of the remaining log.

Let's denote the length of the cut-off portion as z. We can set up the equation:

15 - 6 = z

Simplifying the equation, we get:

z = 9

Therefore, 9 meters of the log were cut off.

Conclusion

In all three solutions, we found that 9 meters of the log were cut off.

Please let me know if there is anything else I can help you with!