JAMB - Mathematics (1983 - No. 17)
Simplify log10 a\(\frac{1}{3}\) + \(\frac{1}{4}\)log10 a - \(\frac{1}{12}\)log10a7
1
\(\frac{7}{6}\)log10 a
zero
10
คำอธิบาย
log10 a\(\frac{1}{3}\) + \(\frac{1}{4}\)log10 a - \(\frac{1}{12}\)log10a7 = log10 a\(\frac{1}{3}\) + log10\(\frac{1}{4}\) - log10 a\(\frac{7}{12}\)
= log10 a\(\frac{7}{12}\) - log10 a\(\frac{7}{12}\)
= log10 1 = 0
= log10 a\(\frac{7}{12}\) - log10 a\(\frac{7}{12}\)
= log10 1 = 0