来自孟子怡的问题
若(z-x)²-4(x-y)(y-z)=0,求证2y=x+z
若(z-x)²-4(x-y)(y-z)=0,求证2y=x+z
1回答
2020-09-28 17:30
若(z-x)²-4(x-y)(y-z)=0,求证2y=x+z
若(z-x)²-4(x-y)(y-z)=0,求证2y=x+z
若(z-x)²-4(x-y)(y-z)=0,求证2y=x+z(z-x)²-4(x-y)(y-z)=(x-z)²-4(x-y)(y-z)=[(x-y)+(y-z)]²-4(x-y)(y-z)=(x-y)²+2(x-y)(y-z)+(y-z)²-4(x-y)(y-z)=(x-y)²-2(x-y)(y-z)+(y-z)&su...