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No. 5²log²6-²log²3 /²log 18
=(²log 6)²-(²log3)²/²log2.3²
Misalkan ²log 3=p
(²log2+²log3)²-(²log3)²/(²log2+2.²log3)
=(1+p)²-p² /1+2p
=p²+2p+1-p² /1+2p
=1+2p / 1+2p
=1
Berarti hasilnya=1
No. 6
³log5².^5log81+⁴log2 per ³log36/4
=2.³log 81+^2² log 2 per ³log9
=2.4+½ per 2
=17/2 : 2
=17/2 x ½=17/4
No. 7
³log(6)^½ dibagi (³log2.3²)²-(³log2)²
Melihat dr no. 5
³log(6)^½ / ³log18.2
=³log(6)^½/³log36
=^36 log 6^½
=^6²log6^½
=½:2=¼