Download 用海伦公式和勾股定理求三角形面积 heron s formula and pythagorean theorem

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用海伦公式和勾股定理求三角形面积 heron s formula and pythagorean theorem 用海伦公式和勾股定理求三角形面积 heron s formula and pythagorean theorem 用海伦公式和勾股定理求三角形面积 heron s formula and pythagorean theorem

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