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《三角形》是初中数学中的重要内容,三边关系定理“三角形的任意两边之和大于第三边,任意两边之差小于第三边”是《三角形》这
“Triangle” is an important part of junior high school mathematics. The theorem of trilateral relations is that “the sum of any two sides of a triangle is greater than the third side, and the difference between any two sides is less than the third.” This is a “triangle.”