9.
已知函数\(f(x)=e^{x}\),\(g(x)=-x^{2}+2x+b(b∈R)\),记\(h(x)=f(x)- \dfrac {1}{f(x)}\)
\((I)\)判断\(h(x)\)的奇偶性,并写出\(h(x)\)的单调区间,均不用证明;
\((II)\)对任意\(x∈[1,2]\),都存在\(x_{1}\),\(x_{2}∈[1,2]\),使得\(f(x)\leqslant f(x_{1})\),\(g(x)\leqslant g(x_{2}).\)若\(f(x_{1})=g(x_{2}).\)求实数\(b\)的值.