a) $\frac{4}{9}$ :(x+0,4)= $\frac{2}{3}$ b)5 ².7 ³.11 ².x+5 ².7 ².11=0 c)5 ².7 ³.11 ².x-5 ².7 ².11^4=0

Bởi

a) $\frac{4}{9}$ :(x+0,4)= $\frac{2}{3}$
b)5 ².7 ³.11 ².x+5 ².7 ².11=0
c)5 ².7 ³.11 ².x-5 ².7 ².11^4=0

0 bình luận về “a) $\frac{4}{9}$ :(x+0,4)= $\frac{2}{3}$ b)5 ².7 ³.11 ².x+5 ².7 ².11=0 c)5 ².7 ³.11 ².x-5 ².7 ².11^4=0”

  2. Đáp án:

    `a,x=4/15` 

    `b,x=-1/77`

    `c,x=121/7`

    Giải thích các bước giải:

    `a,4/9:(x+0,4)=2/3`

    `=>x+2/5=4/9:2/3`

    `=>x+2/5=2/3`

    `=>x=2/3-2/5`

    `=>x=4/15`

    `b,5 ^2. 7 ^3. 11 ^2.x+5 ^2. 7 ^2. 11=0`

    `=>5 ^2. 7 ^2. 11 .(7.11.x+1)=0`

    `=>7.11.x+1=0`

    `=>77x=-1`

    `=>x=-1/77`

    `c,5 ^2 .7 ^3 .11 ^2 .x-5 ^2 .7 ^2 .11^4=0`

    `=>5 ^2 .7 ^2 .11 ^2 .(7.x-11^2)=0`

    `=>7.x-11^2=0`

    `=>7.x-121=0`

    `=>7.x=121`

    `=>x=121/7`

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