GTNN A= 0
GTNN B= -1
GTLN C = 0,5
GTLN D = 3
Để : \(A=3,7\left|4,3-x\right|min\)
Thì :\(\left|4,3-x\right|\)Phải min
Ta có :\(\left|4,3-x\right|\ge0\)
\(\Rightarrow\left|4,3-x\right|min=0\)
\(\Rightarrow4,3-x=0\Rightarrow x=4,3\)
\(\Rightarrow Amin=3,7X4.3=15.91\)