log 3 21 = log 3 (3*7) = 1 + log 3 7
log 3 21 - 1 = log 3 7
log 3 7 + log 3 5= log 3 35 = 0,5*log (sqrt3) 35; log (sqrt3) 35 = 2*(log 3 7 + log 3 5) = 2*(log 3 21 - 1 + log 3 5)=2*(a+b-1)
Ответ: 2*(a+b-1)
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log 3 21 = log 3 (3*7) = 1 + log 3 7
log 3 21 - 1 = log 3 7
log 3 7 + log 3 5= log 3 35 = 0,5*log (sqrt3) 35; log (sqrt3) 35 = 2*(log 3 7 + log 3 5) = 2*(log 3 21 - 1 + log 3 5)=2*(a+b-1)
Ответ: 2*(a+b-1)