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  • 簡(jiǎn)化份數(shù) (3^2008)^2-(3^2006)^2/(3^2007)^2-(3^2005)^2

    簡(jiǎn)化份數(shù) (3^2008)^2-(3^2006)^2/(3^2007)^2-(3^2005)^2
    另外的是英文題 heather compares the price of a new computer at two different stores.store A offers 15% off the sticker price followed by a $90 rebate,and store B offers 25% off the sticker price with no rebate.heather saves $15 by buying the computer at store A instead of store B.what is the sticker price of the computer,in dollars?
    英語人氣:513 ℃時(shí)間:2020-06-25 03:37:49
    優(yōu)質(zhì)解答
    (3^2008+3^2006)(3^2008-3^2006)/(3^2007+3^2005)(3^2007-3^2005)
    =(3^2008+3^2006)*8*3^2006/(3^2007+3^2005)*8*3^2005
    =(3^2008+3^2006)*3/(3^2007+3^2005)
    =(27+3)*3/(9+1)=9
    suppose the sticker price of the computer is x dollars
    then the formula as the follow comes into existence
    X*(1-15%)-90+15=X(1-25%)
    so
    x=750 dollars
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