Question

已知f(x)=x^2+ax=a(a<=2,x属于R),g(x)=e^-x,Q(x)=f(x)g(x)

(1)当a=1时,求Q(x)的单调区间;(2)求g(x)在点(0,1)处的切线与直线x=1及曲线g(x)所围成的封闭图形的面积;
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