计算 [(x-y)²+(x+y)²](x²-y²)

来源:学生作业学帮网 编辑:学帮网 时间:2024/06/01 07:39:55

计算 [(x-y)²+(x+y)²](x²-y²)

[(x-y)²+(x+y)²](x²-y²) =(x²-2xy+y²+x²+2xy+y²)(x²-y²)
=2(x²+y²)(x²-y²)
=2(x⁴-y⁴)
=2x⁴-2y⁴

=2(x²-y²) ²