\(A,\)
Với \(x=-1;y=0,5\)
\(\Rightarrow P=\left(-1\right)^3.0,5-14.\left(-1\right)^3-6.\left(-1\right).0,5^2+0,5+2\)
\(=-0,5+14+1,5+0,5+2\)
\(=17,5\)
\(B,\)
Với \(x=0,2;y=-1,2\)
\(\Rightarrow Q=15.0,2^2.\left(-1,2\right)-5.0,2.\left(-1,2\right)^2+7.0,2.\left(-1,2\right)-21\)
\(=-0,72-1,44-1,68-21\)
\(=-24,84\).