Current location - Training Enrollment Network - Mathematics courses - See 3 points and 7 points for math.
See 3 points and 7 points for math.
1- 1/7-3/7=3/7 Drink three-sevenths more, and this glass of water will be gone.

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~ mobile phone questioner is satisfied with the evaluation point in the upper right corner of the client.

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O(∩_∩)O, remember to praise the adoption, help each other and wish * * * common progress!