(ABOD)=1/2R^2sinθ =_R2.S_BoD=R2sineS_q=f(θ)=S_B-S_(△BOD)=1/2R^2(θ-sinθ) (2)设总利润为y元,种植草皮利润为y1元,种植花卉利润为y2元,种植学校观赏植物成本为y元. y_1=30(1/2πR^2-1/2R^2θ),y_2=80*1/2R^2sinθ,y_3=20*1/2 n)则 y=y_1+y_2-y_3=30(...