a) log2 225 -2/ log5 2 - log2 9 +51/log925 =
log2 152 -2* log2 5 - log2 32
+ 5log259=2* log2 15-2* log2 5
– 2*log2 3+52*1/2* log53=2* log2 15-2*(
log2 5*3) +3=2* log2 15 - 2* log2 15
+ 3=2* log2 15/15 + 3=2* log2 1 + 3=2*0 +3=3
b) …=6-1/2 * 6log6√3/2 - 2-1/2 * 2log21/2=1/√6 *√3/2 - 1/√2
*1/2=√3/2√6 - 1/2√2=√18/12 - √2/4=(√18 - 3√2)/12=0/12=0