初一数学题与代数式有关化简(a+b)(a^2-3ab=9b^2)-(a-3b)(a^2+3ab+9b^2)(x+y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z)已知z^2=x^2+y^2,化简(x+y+z)(x-y+z)(-x+y+z)(x+y-z)已知x(x-1)-(x^2-y)=-2求x^2+y^2/2-xy不需要完整的过程有2步
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![初一数学题与代数式有关化简(a+b)(a^2-3ab=9b^2)-(a-3b)(a^2+3ab+9b^2)(x+y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z)已知z^2=x^2+y^2,化简(x+y+z)(x-y+z)(-x+y+z)(x+y-z)已知x(x-1)-(x^2-y)=-2求x^2+y^2/2-xy不需要完整的过程有2步](/uploads/image/z/7091062-70-2.jpg?t=%E5%88%9D%E4%B8%80%E6%95%B0%E5%AD%A6%E9%A2%98%E4%B8%8E%E4%BB%A3%E6%95%B0%E5%BC%8F%E6%9C%89%E5%85%B3%E5%8C%96%E7%AE%80%EF%BC%88a%2Bb%29%28a%5E2-3ab%3D9b%5E2%29-%28a-3b%29%28a%5E2%2B3ab%2B9b%5E2%29%EF%BC%88x%2By%29%5E2%28y%2Bz-x%29%28z%2Bx-y%29%2B%28x-y%29%5E2%28x%2By%2Bz%29%28x%2By-z%29%E5%B7%B2%E7%9F%A5z%5E2%3Dx%5E2%2By%5E2%2C%E5%8C%96%E7%AE%80%EF%BC%88x%2By%2Bz%29%28x-y%2Bz%29%28-x%2By%2Bz%29%28x%2By-z%29%E5%B7%B2%E7%9F%A5x%28x-1%29-%28x%5E2-y%29%3D-2%E6%B1%82x%5E2%2By%5E2%2F2-xy%E4%B8%8D%E9%9C%80%E8%A6%81%E5%AE%8C%E6%95%B4%E7%9A%84%E8%BF%87%E7%A8%8B%E6%9C%892%E6%AD%A5)
初一数学题与代数式有关化简(a+b)(a^2-3ab=9b^2)-(a-3b)(a^2+3ab+9b^2)(x+y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z)已知z^2=x^2+y^2,化简(x+y+z)(x-y+z)(-x+y+z)(x+y-z)已知x(x-1)-(x^2-y)=-2求x^2+y^2/2-xy不需要完整的过程有2步
初一数学题与代数式有关
化简
(a+b)(a^2-3ab=9b^2)-(a-3b)(a^2+3ab+9b^2)
(x+y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z)
已知z^2=x^2+y^2,化简(x+y+z)(x-y+z)(-x+y+z)(x+y-z)
已知x(x-1)-(x^2-y)=-2
求x^2+y^2/2-xy
不需要完整的过程有2步到3步过程就可以了
初一数学题与代数式有关化简(a+b)(a^2-3ab=9b^2)-(a-3b)(a^2+3ab+9b^2)(x+y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z)已知z^2=x^2+y^2,化简(x+y+z)(x-y+z)(-x+y+z)(x+y-z)已知x(x-1)-(x^2-y)=-2求x^2+y^2/2-xy不需要完整的过程有2步
2.
(x+y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z)
=(x+y)^2[z-(x-y)](z+x-y)+(x-y)^2[(x+y)^2-z^2]
=(x+y)^2z^2(x^2-y^2)^2+(x^2-y^2)^2-(x-y)^2z^2
=4xyz^2
写清楚点
什么意思