⑩天掌 Teaching Plan on Advanced Mathematics 曲边梯形面积的近似值为 A≈∑f(5x i=1 当分割无限加细,即小区间小区间的最 =max{△x1,Ax2,…Axn} 趋近于客(→>0)时, 曲边梯形面积为A=lim∑f(5)x 1-0Tianjin Polytechnic University Teaching Plan on Advanced Mathematics i n i A   f i x = ( ) 1  曲边梯形面积的近似值为 趋近于零 时， 当分割无限加细 即小区间小区间的最 (λ 0) λ max{ x ,Δx , Δx } , 1 2 n → =   i n i A =  f i x = → lim ( ) 1 0   曲边梯形面积为