Tìm GTNN của:
A = 49x2 - 28x + 25
B = 8x2 - 28x - 1
C = (2x2 + 5)2 +10
D = 3x2 - 8x + 7
E = x4 - 2x2 +12
F = 4x2 + 12x + 2
G = 8(a + 2)3 - (2a +1)3
H = (x - 1)(x + 5)(x2 + 4x + 5)
I = (x6 + 6)2
K = 3x2 +2x + \(\dfrac{4}{3}\)
L = 4x2 - 28x + \(\dfrac{105}{3}\)
M = (x2 + x )2 - 2(x2 +x) - 10
N = (x2 + 2x)2 + 9x2 + 18x + 30
P = (x + 1)(x + 2)(x + 3)(x + 4) - 32
Q = x2 - 2xy + y2 + 3x - 3y + 1
R = 4x2 + \(\dfrac{1}{x^2}-20\left(x>0\right)\)
CÁC BẠN GIÚP MIK NHA , CẦN GẤP LẮM !!!