验证：
x值 公式
0.3402.300124671
0.3902.559401618
0.4402.701101075
0.4902.809241518
0.5402.899271996
0.5902.977496439
0.6403.047227606
0.6903.110461992
0.7403.168512846
0.7903.222298444
0.8403.272490606
0.8903.319598292
0.9403.364017924
0.9903.406065324
1.0403.445996852
1.0903.484023911
1.1403.520323189
1.1903.555044084
1.2403.588314193
1.2903.620243463
1.3403.650927367
1.3903.680449381
1.4403.708882942
1.4903.736293001
1.5403.762737283
1.5903.788267315
1.6403.812929265
1.6903.83676464
1.7403.859810867
1.7903.882101783
1.8403.903668046
1.8903.924537487
1.9403.944735408
1.9903.964284838
2.0403.983206753
2.0904.001520268
2.1404.019242798
2.1904.036390206
2.2404.052976921
2.2904.069016051
2.3404.084519472
2.3904.099497912
2.4404.113961018
2.4904.12791742
2.5404.14137478
2.5904.154339836
2.6404.166818437
2.6904.178815575
2.7404.190335406
2.7904.201381267
2.8404.211955686
2.8904.222060389
2.9404.2316963
2.9904.240863531
3.0404.24956137
3.0904.257788265
3.1404.265541795
3.1904.272818638
3.2404.279614528
3.2904.285924205
3.3404.291741356
3.3904.29705854
3.4404.301867104
3.4904.306157083
3.5404.309917081
3.5904.31313413
3.6404.315793529
3.6904.317878645
3.7404.319370689
3.7904.320248438
3.8314.320493079
3.8324.320493564
3.8334.320493784
3.8344.32049374
3.8354.320493431
3.8364.320492858
3.8404.320487909
3.8904.320061969
3.9404.318939855
3.9904.317086594
4.0404.314462297
4.0904.311021268
4.1404.306710899
4.1904.30147027
4.2404.295228342
4.2904.287901613
4.3404.279391005
4.3904.269577676
4.4404.258317232
4.4904.245431559
4.5404.230696932
4.5904.213826101
4.6404.194440151
4.6904.172021933
4.7404.145833744
4.7904.114758629
4.8404.076955262
4.8904.028958789
4.9403.962475033
4.9903.837646318