(-x^2+3xy-1/2y^2)-(1/2x^2+4xy-3/2y^2)=-1/2x^2+*+y^2,其中*为未知的一个字母或数字.求*和最后结果可以说说你计算的过程么?
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/26 11:16:49
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计算3xy[2xy-x(y-2)+x-1]
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