Tolong bantuannya guys :d

Cuma bisa bantu 3 nomer.. Semoga membantu
1.)13/4-√3
=13/4-√3 x 4+√3/4+√3
=13(4+√3)/16-3
=13(4+√3)/13
=4+√3
2.)diket:²log3=m,²log5=n
²log 90=²log 9.10
=²log 3²+²log5.2
=2.²log 3+ ²log 5+²log 2
=2m+n+1
4.)²log 4+²log12-²log6
=²log 4.12/6
=²log 8
=²log 8=3