(0≤x≤1)F(x)=∫(-∞,+∞)f(x)dx=∫[0,x]f(t)dt =∫[0,x]tdt =t^2/2[0,x]=x^2/21≤x≤2时F(x)=∫(-∞,+∞)f(x)dx=∫[0,1]tdt +∫[1,x](2-t)dt=1/2+(2t-t^2/2)[1,x]=1/2+2x-x^2/2-2+1/2=2x-x^2/2-1x≥0时F(x)=1P{x>=...