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
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![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](/uploads/image/z/1268979-51-9.jpg?t=%E4%B9%98%E6%B3%95%E5%85%AC%E5%BC%8F%E7%9A%84%E8%BF%90%E7%94%A8%EF%BC%9A%E2%91%A0x%26%23178%3B%2By%26%23178%3B%3D%EF%BC%88x%2By%EF%BC%89%26%23178%3B-_____%3D%EF%BC%88x-y%EF%BC%89%26%23178%3B%2B______.%E2%91%A1%EF%BC%88x-y%2Bz%EF%BC%89%EF%BC%88-x%2By%2Bz%EF%BC%89%3D%5Bz%2B%EF%BC%88______%EF%BC%89%5D%5Bz-%EF%BC%88______%EF%BC%89%5D%3Dz%26%23178%3B-%EF%BC%88_____%EF%BC%89%26%23178%3B)
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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
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
①x²+y²=(x+y)²-2xy=(x-y)²+2xy
②(x-y+z)(-x+y+z)=[z+(x-y)][z-(x-y)]=z²-(x-y)²
1.2xy,2xy;
2.(x-y+z)(-x+y+z)
=[z+(x-y)][z-(x-y)]
=z²-(x-y)²
=z²-x²+2xy+y².
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