The last block will still be covered except you'll block a couple IP addresses at the end of the block that weren't in your original range
A useful tool that I've found:
http://ip2cidr.com/ -- it has a bulk conversion tool where you can stick in a list of ranges and it poops out the proper Apache config for either allow or deny
In your case it'd be:
deny from 61.14.41.136/29
deny from 61.14.132.32/27
deny from 61.14.132.64/27
deny from 61.14.132.128/25
(as cd34 already pointed out too

)