2A压缩律y=1+1mA 1+ln ax 1+In d 6 A=876 820 2 A压缩律 A x A Ax y 1 0 1 ln   + = 1 1 1 ln 1 ln   + + = x A A Ax y 8 1 8 4 8 6 1 x y 2 1 4 1 8 1 1 A = 87.6