来自罗澜的问题
乘法公式的运用:①x²+y²=(x+y)²-_____=(x-y)²+______.②(x-y+z)(-x+y+z)=[z+(______)][z-(______)]=z²-(_____)²
乘法公式的运用:①x²+y²=(x+y)²-_____=(x-y)²+______.
②(x-y+z)(-x+y+z)=[z+(______)][z-(______)]=z²-(_____)²
1回答
2020-06-15 14:20