[填空题]
The following table bwj*dce d.6z2 l 1lcn,sh5 fgvowr; km3a fmst(x-y)d 72h1ilh0 ows the x and y coordinates of five points that lie on7fifmatlxm0 ;5r 2goy-wd ( 3v)h1hk s a curve y=f(x) .
1. Estimate the area under the curve over the interval 1 The equation of the curve was found to be y=-$\frac{1}{10}(4 x+5)(x-8)$ .
it is approximately equal to units$^2$
2. Find the exact value of the area under the curve over the interval 1A=$\frac{a}{b}$;a= ,b= .
3. Find the percentage error between the estimation in part (a) and the exact value in part (b). Provide a reason for the difference.it is approximately equal to %(two decimal places)
