计算下列各题:[2/3x²-2/(x²+y²)乘以(x²+y²)/3x²-x²-y²)]
问题描述：
计算下列各题:[2/3x²-2/(x²+y²)乘以(x²+y²)/3x²-x²-y²)]
答
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?