Câu 1:
a, CMR: Nếu (y-z)
2+(z-x)
2+(x-y)
2 = (y+z-2x)
2+(z+x-2y)
2+(y+x-2z)
2thì x = y = z.
b, Cho x
2-y = a; y
2-z = b; z
2-x = c.
Tính P = x
3(z-y
2)+ y
3(x-z
2)+ z
3(y-x
2)+xyz(xyz-1)
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