作业帮1.(x+y-z)*(x-y+z) 2.(x+y+z)*(x-y+z)要完整的过程
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1.(x+y-z)*(x-y+z) 2.(x+y+z)*(x-y+z)要完整的过程
1.(x+y-z)*(x-y+z) 2.(x+y+z)*(x-y+z)要完整的过程
1.(x+y-z)*(x-y+z) 2.(x+y+z)*(x-y+z)要完整的过程
1.(x+y-z)*(x-y+z)
=[x+(y-z)][x-(y-z)]
=x²-(y-z)²
=x²-y²-z²+2yz
2.(x+y+z)*(x-y+z)
=[(x+z)+y][(x+z)-y]
=(x+z)²-y²
=x²+z²+2xz-y²
=x2-（y-z）2
=（x+z）2-y2
分开的平方差公式
说的复杂点好了1.(x+y-z)*(x-y+z) 2.(x+y+z)*(x-y+z)
=x^2-xy+xz+xy-y^2+yz-zx+zy-z^2 =x^2-xy+xz+xy-y^2+yz+xz-zy+z^2
=x^2-y^2-z^2+2yz =x^2-y^2+z^2+2xz
这是一条公式:得X平方-Y平方-Z平方
1.(x+y-z)*(x-y+z) 2.(x+y+z)*(x-y+z)要完整的过程
x-y/(z-x)(z-y) 一y-z/(x-y)(x-z) ＋z-x/(y-z)(y-x)
x^-(y-z)^/(x+y)^-z^
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