task/29628033 log2 (18) / log36 (2) - log2 (9) / log72 (2) * *loga (b)*logb(a) =1 * *
log2 (18)*log2 (36)-log2 (9)*log2 (72) = ||18 =2*3² ; 36 =2²*3² ;72 =8*9 = 2³ *3² ||
= [1 +2log2 (3)]*[2+2log2 (3] -2log2 (3)*[3 +2log2 (3) ] =2 .
* * *a = log2 (3) → (1+2a)(2+2a) -2a(3+2a) =4a²+6a +2 -6a -4a² =2 * * *
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task/29628033 log2 (18) / log36 (2) - log2 (9) / log72 (2) * *loga (b)*logb(a) =1 * *
log2 (18)*log2 (36)-log2 (9)*log2 (72) = ||18 =2*3² ; 36 =2²*3² ;72 =8*9 = 2³ *3² ||
= [1 +2log2 (3)]*[2+2log2 (3] -2log2 (3)*[3 +2log2 (3) ] =2 .
* * *a = log2 (3) → (1+2a)(2+2a) -2a(3+2a) =4a²+6a +2 -6a -4a² =2 * * *