na=11a=151a=11a=15 220.35720.1443320.35680.4531 231:7261552331.7262.394 240.35670.6526340.35680.1449 251.7262.178351.7261.557 260.356902167360.35680.6481 271.7261.973371.7262.186 280.356803147380.356802137 291.7262.287391.7261.960 300.35690.1771400356803225 311.7261676 按(7)式(b=23和不同的a)计算的x22 0.3572 0.1443 32 0.3568 0.4531 23 1.726 1.552 33 1.726 2.394 24 0.3567 0.6526 34 0.3568 0.1449 25 1.726 2.178 35 1.726 1.557 26 0.3569 0.2167 36 0.3568 0.6481 27 1.726 1.973 37 1.726 2.186 28 0.3568 0.3147 38 0.3568 0.2137 29 1.726 2.287 39 1.726 1.960 30 0.3569 0.1771 40 0.3568 0.3225 31 1.726 1.676 n a =11 a =15 n a =11 a =15 按（7）式（b=2.3和不同的a）计算的 n x