计算(2X^3-3X^2Y-2XY^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)的值,其中x=0.5,Y=-1时,小明同学把X=0.5抄成X=-0.5,但他的计算结果也是正确的,试说明理由.并求出这个结果
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/25 23:33:11
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