化简:7y(x-3y)²-(3y-x)²

来源:学生作业学帮网 编辑:学帮网 时间:2024/05/26 19:23:41

化简:7y(x-3y)²-(3y-x)²

7y(x-3y)²-(3y-x)²=7y(x-3y)²-(x-3y)²=(7y-1)(x-3y)²

=(7y-1)(x-3y)²