(1)(x²-2y²-z²0-(-y²+3x²-z ²)+(5x²-y²+2x²)

问题描述:

(1)(x²-2y²-z²0-(-y²+3x²-z ²)+(5x²-y²+2x²)

最后一个括号应为 (5x²-y²+2z²)(x²-2y²-z²) -(-y²+3x²-z²) + (5x²-y²+2z²)= x²-2y²-z²+ y²-3x²+z² + 5x²-y...