Tìm Min: A = 3x^2 - 2x - 1

1 Tìm Min
a) A=3x^2 - 2x-1
b) B= x^4- 2x^3-4x+5
c) C= x^2-2xy+4y^2-2x-10y+8
d) D= 2x^2+9y^2-6xy-6x-12y+2004
Tks~~ >