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i had the same problem.
i went to internet router and add there static routes to my vlans.
such as:
192.168.4.0 255.255.255.0 192.168.1.1
192.168.2.0 255.255.255.0 192.168.1.1
Where 192.168.1.1 - c3750 svi ip.
(My router`s ip is 192.168.1.15)
Aft...