x+y=-z,则(x^2-y^2)+(xz-yz)的值为
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x+y=-z,则(x^2-y^2)+(xz-yz)的值为x+y=-z,则(x^2-y^2)+(xz-yz)的值为x+y=-z,则(x^2-y^2)+(xz-yz)的值为原式可以写成(X+Y)*(X-Y
x+y=-z,则(x^2-y^2)+(xz-yz)的值为
x+y=-z,则(x^2-y^2)+(xz-yz)的值为
x+y=-z,则(x^2-y^2)+(xz-yz)的值为
原式可以写成(X+Y)*(X-Y)+Z(X-Y)
把X+Y=-Z代入就可得
-Z(X-Y)+Z(X-Y)
最后结果等于0
0
答案就是:0.咯~~~~~~~~
若x+y+z=3y=2z,则x/x+y+z=?
若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)=
若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)=
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x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值
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