计算下列各题:[2/3x²-2/(x²+y²)乘以(x²+y²)/3x²-x²-y²)]

计算下列各题:[2/3x²-2/(x²+y²)乘以(x²+y²)/3x²-x²-y²)]

2/3x²-2/(x²+y²)*(x²+y²)/3x²-x²-y²
=2/3x²-2/3x²-x²-y²
=-x²-y²
您所写的式子是这样子的吗?

能写清楚一些吗