Giúp mik với nha, đang gấp lắm: Tìm x, biết:

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Giúp mik với nha, đang gấp lắm:
Tìm x, biết:
giup-mik-voi-nha-dang-gap-lam-tim-biet

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Latifah 5 years 2021-05-22T22:41:58+00:00 1 Answers 21 views 0

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  1. thugiang
    0
    2021-05-22T22:42:58+00:00
    Reply

    Giải thích các bước giải:

    `b) (x-5)/95 + (x-10)/90 + (x-15)/85 = (x-95)/5 + (x-90)/10 + (x-85)/15`

    `=> ((x-5)/95 – 1 ) + ((x-10)/90 – 1 ) + ((x-15)/85 – 1 ) = ((x-95)/5 – 1 ) + ((x-90)/10 – 1) + ((x-85)/15 – 1)`

    `=> (x-100)/95 + (x-100)/90 + (x-100)/85 = (x-100)/5 + (x-100)/10 + (x-100)/15`

    `=> (x-100)/95 + (x-100)/90 + (x-100)/85 – (x-100)/5 – (x-100)/10 – (x-100)/15 = 0`

    `=> (x-100)(1/95 + 1/90 + 1/85 – 1/5 – 1/10 – 1/15 ) =0`

    `=> x-100 = 0`

    `=> x=100`

    $\\$

    `c) (x-3)/15 + (x-10)/4 + (x+3)/7 = 6`

    `=> ((x-3)/15 – 1 ) + ((x-10)/4 – 2) + ((x+3)/7 – 3 ) = 0`

    `=> (x-18)/15 + (x-18)/4 + (x-18)/7 = 0`

    `=> (x-18)(1/15 + 1/4 + 1/7)=0`

    `=> x-18=0`

    `=> x=18`

    $\\$

    `d) (x+2)/8 + (x+3)/7 + (x+4)/6 = (x+8)/2 + (x+7)/3 + (x+6)/4`

    `=> ((x+2)/8 + 1 ) + ((x+3)/7 + 1 ) + ((x+4)/6 +1 ) = ((x+8)/2 + 1) + ((x+7)/3 + 1 ) + ((x+6)/4 + 1)`

    `=> (x+10)/8 + (x+10)/7 + (x+10)/6 = (x+10)/2 + (x+10)/3 + (x+10)/4`

    `=> (x+10)/8 + (x+10)/7 + (x+10)/6 – (x+10)/2 – (x+10)/3 – (x+10)/4 = 0`

    `=> (x+10)(1/8 + 1/7 + 1/6 – 1/2 – 1/3 – 1/4)=0`

    `=> x+10 = 0`

    `=> x=-10`

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