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cpp1
- 对于任意四边形ABCD,其对角线AC与BD的中点分别是M、N,AB、CD的延长线交于X。编制C++程序以验证三角形XMN的面积是四边形ABCD面积的1/4。-For arbitrary quadrilateral of ABCD its diagonals AC and BD, the midpoint is M, N, AB, CD extension cable cross-X. The prepare C++ procedures to verify that the area of