Đáp án:

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`a) 2 1/3 . x + 0,6 = 1/2`

`-> 2 1/3 . x = 1/2 - 0,6`

`-> 2 1/3 . x = -0,1`

`-> x = (-0,1) : 2 1/3`

`-> x = (-0,1) : 7/3`

`-> x = (-0,1) . 3/7`

`-> x = -3/70`

Vậy `x = -3/70`

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`b)(x - 5/24) . 18/55 = -12/55`

`-> (x- 5/4) = (-12/55) : 18/55`

`-> (x - 5/4) = (-12/55) . 55/18`

`-> (x - 5/4) = -2/3`

`-> x = (-2/3) + 5/24`

`-> x = -11/24`

Vậy `x = -11/24`

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`c) x/3 = 2/3 + (-1/7)`

`-> x/3 = 11/21`

`-> 21.x = 3.11`

`-> 21x = 33`

`-> x = 33 : 21`

`-> x = 11/7`

Vậy `x = 11/7`

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`d) x^2 : 16/11 = 11/4`

`-> x^2 = 11/4 . 16/11`

`-> x^2 = 16/4`

`-> x^2 = 4`

`-> x^2 = 2^2`

`-> x^2 = +-2`

Vậy `x in {+-2}`

Giải thích các bước giải:

 

Đáp án + Giải thích các bước giải:

Bài `3` :

`a)2 1/3x+0,6=1/2`

`2 1/3x+3/5=1/2`

`2 1/3x=1/2-3/5`

`7/3 x=-1/10`

`x=(-1/10):7/3`

`x=-3/70`

Vậy `x=-3/70`

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`b)(x-5/24)` `.` `18/55=-12/55`

`x-5/24=(-12/55):18/55`

`x-5/24=-2/3`

`x=-2/3+5/24`

`x=-11/24`

Vậy `x=-11/24`

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`c)x/3=2/3+{-1}/7`

`x/3=11/21`

`=>` `21x=3.11`

`=>` `21x=33`

`=>` `x=33` `:` `21`

`=>` `x=11/7`

Vậy `x=11/7`

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`d)x^2:16/11=11/4`

`x^2=11/4` `.` `16/11`

`x^2=4`

`x^2=2^2` hoặc `(-2)^2`

`=>` `x=+-2`

Vậy `x=+-2`