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Math problem 20 12 national middle school students' math ability competition, the second group of junior high school students' first test questions.
You can only cut two knives, right?

Divided into 1/7 and 2/7, and the rest is 4/7.

The first 1 day 1/7

Give 2/7 the next day, and ask for 1/7.

Give it to 1/7 on the third day.

Give it to 4/7 on the fourth day and get it back 1/7 2/7.

Give it to 1/7 on the fifth day.

Give 2/7 on the sixth day, and take back 1/7.

Give it to 1/7 on the seventh day.

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