2b²c²+2c²a²+2a²b²-a^4-b^4-c^42x²+5xy-4y²(y+1)^4+(y+3)^4-272(xy-1)²+(x+y-2)(x+y-2xy)x^4-x^3+4x²+3x+5
来源:学生作业帮助网 编辑:作业帮 时间:2024/12/02 21:00:14
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