计算：(x+y)²-4(x+y)(x-y)+4(x-y)²

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/08 21:05:20

计算：(x+y)²-4(x+y)(x-y)+4(x-y)²
2.已知x=y=5,xy=-6,求3x²+3y²

(x+y)²-4(x+y)(x-y)+4(x-y)²
=[(x+y)-2(x-y)]²
=(x+y-2x+2y)²
=(-x+3y)²
=x²-6xy+9y²
已知x+y=5,xy=-6,求3x²+3y²
3x²+3y²
=3(x²+y²)
=3[(x+y)²-2xy]
=3×(25+12)
=111

计算：(x+y)²-4(x+y)(x-y)+4(x-y)² 计算 [12(x+y)³(y-x)]³÷[4(x+y)²（x-y)]² (2x-y)²-4(x-y)(x+2y) 化简：（2x-y)²-4(x-y)(x+y) (x+y)²+4(x+y)-5 [(3x+y)²-(3x-y)²]÷(4x-2y)计算怎么做? 分解因式计算6x³y（x-y)³-4xy³(y-x)² 计算4（x+y）^5（x-y）^4÷[2（x+y）³*（y-x）²] 化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)² （x-2y）²+（2x-4y)(x+y)+(x+y)² 因式分解：(x-y)(3x-7y)²-4(x-y)(x+y)² (x-3y)(y+2x)-(4y-3x)(3x+4y)计算