3.

() ()
3102550759097
2.0 - 2.57889101112
77889 910
2.6 - 3.088910101112
7 8 89101111
3.1 - 3.589910111213
7 8 910111212
3.6 - 4.0 9101011121313
8 9 910111212
4.1 - 4.5 9101111121314
9 91011121313
4.6 - 5.0 9101112131414
9101111121313
5.1 - 6.01011