1
log(6)28-log(6)14+log(6)18=log(6)(28*18/14)=log(6)36=2
2
8^(-log(8)4)-log(1/3)3/log(1/3)3=8^log(8)1/4 - 1=1/4-1=-3/4
3
lgx=lg(c+r)+lg(c²-cr+r²)
lgx=lg[(c+r)(c²-cr+r²)]
lgx=lg(c³+r³)
lg(64+0)
x=64
4
log(1/11)18=lg(1/11)2+2log(1/11)3=z+2t
5
4^2log(4)6 +log(1/5)1=4^log(4)36+0=36