a) -7/17.(-34) b) 1/3+1/2.x=-5/6 c) x+1/3=-7/26.13/6

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1. Đáp án:

    

   Giải thích các bước giải:

   `a) -7/17.(-34) `

   `=7/17. 2.17`

   `=7.2=14`

   ` b) 1/3+1/2.x=-5/6`

   `=>1/2.x=-5/6-1/3`

   `=>1/2 .x=-7/6`

   `=>x=-7/6:1/2`

   `=>x=-7/3`

   ` c) x+1/3=-7/26. 13/6`

   `=>x+1/3=-7/12`

   `=>x=-7/12-1/3`

   `=>x=-11/12`

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2. Tính:

   a) $-7/17$ $.$ $(-34)$ $=$ $(-7).(-34)/17$ $=$ $14$

   Tìm x:

   b) $1/3$ $+$ $1/2x$ $=$ $-5/6$

   $1/2x$ $=$ $-5/6$ $-$ $1/3$

   $1/2x$ $=$ $-5/6$ $-$ $2/6$

   $1/2x$ $=$ $-7/6$

   $x$ $=$ $-7/6$ $÷$ $1/2$

   $x$ $=$ $-7/3$

   Vậy $x=-7/3$.

   c) $x+1/3=-7/26.13/6$

   $x+1/3=-7/12$

   $x=-7/12-1/3$

   $x=-7/12-4/12$

   $x=-11/12$

   Vậy $x=-11/12.$

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