Subject

    গাণিতিক যুক্তি

    Topic

    সূচক ও লগারিদম

    7log(10/9) - 2log(25/24) +3log(81/80)=কত?

    ক)
    log3
    খ)
    log2
    গ)
    3log2
    ঘ)
    2log3

    Explanation

    7log(10/9) - 2log(25/24) +3log(81/80) =7(log10-log9) - 2 (log25-log24) + 3 (log81-log80) =7(log2.5-log3 2 )-2(log5 2 - log3.2 3 ) + 3 (log3 4 -log2 4 .5) =7(log2+log5-2log3) - 2(2log5 - log3-3log2) + 3(4log3-4log2-log5) =7log2+7log5-14log3-4log5+2log3+6log2+12log3-12log2-3log5 =log2

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