6.
由直线\(x=1\),\(x=2\),曲线\(y= \dfrac{1}{x} \)及\(x\)轴所围成的封闭图形的面积是 .
若复数\(z\)满足\((3+4\)\(i\)\()\)\(z\)\(=|3-4\)\(i\)\(|\),其中\(i\)为虚数单位,则\(z\)虚部为
若函数\(f\)\((\)\(x\)\()=\)\(x\)\({\,\!}^{3}-3\)\(x\)在\((\)\(a\),\(6-\)\(a\)\({\,\!}^{2})\)上有最大值,则实数\(a\)的取值范围是
已知函数\(f\)\((\)\(x\)\()=\ln \) \(x\)\(- \dfrac{1}{4} \) \(x\)\(+ \dfrac{3}{4x} -1\),\(g\)\((\)\(x\)\()=-\)\(x\)\({\,\!}^{2}+2\)\(bx\)\(-4\),若对任意的\(x\)\({\,\!}_{1}∈(0,2)\),任意的\(x\)\({\,\!}_{2}∈[1,2]\),不等式\(f\)\((\)\(x\)\({\,\!}_{1})\geqslant \)\(g\)\((\)\(x\)\({\,\!}_{2})\)恒成立,则实数\(b\)的取值范围是