jak obliczyć działanie z logarytmem karo: wiedząc, że log12=a, log2=b oblicz log90

Bogdan: a = log12 = log(3*2²) = log3 + log2² = log3 + 2log2 = log3 + 2b log3 = a − 2b log90 = log(10*9) = log10 + log3² = 1 + 2log3 = .... Dokończ