Mathematics
Senior High
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log15ใฎ3๐ŸŸฐaใ€log3ใฎ2๐ŸŸฐbใฎๆ™‚ใซlog15ใฎ2ใฏใ€ใฉใ†่กจใ›ใ‚‹ใ‹ใ€ใจใ„ใ†ๅ•้กŒใงใ™ใ€‚็ญ”ใˆใฏabใชใฎใงใ™ใŒใ€ๅ†™็œŸใฎใ‚ˆใ†ใช็ญ”ใˆใซใชใฃใฆใ‚‚ใŠใ‹ใ—ใใชใ„ใจๆ€ใ†ใฎใงใ™ใ€‚่ชฐใ‹่‡ชๅˆ†ใฎ้–“้•ใˆใ‚’ๆŒ‡ๆ‘˜ใ—ใฆ้ ‚ใใŸใ„ใงใ™ใ€‚

361 (1) log 152 = 10g315 = log32 - log32-logว15 = logว2- (log)=b-a logis3
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