Tìm x 3/7+4/7x=-5/14 2/5x+3/10=-7/15 -3/4x-2/5=7/10 -5/6x+1/8=7/14 1/2-2x=-5/4

0 bình luận về “Tìm x 3/7+4/7x=-5/14 2/5x+3/10=-7/15 -3/4x-2/5=7/10 -5/6x+1/8=7/14 1/2-2x=-5/4”

1. Đáp án + giải thích bước giải :

   `1) 3/7 + 4/7x = (-5)/14`

   `-> 4/7x = -5/14 – 3/7`

   `-> 4/7x = -11/14`

   `-> x = -11/14 : 4/7`

   `-> x = -11/8`

   `2) 2/5x + 3/10 = -7/15`

   `-> 2/5x = -7/15 – 3/10`

   `-> 2/5x = -23/30`

   `-> x = -23/30 : 2/5`

   `-> x = -23/12`

   `3) -3/4x – 2/5 = 7/10`

   `-> -3/4x = 7/10 + 2/5`

   `-> -3/4x = 11/10`

   `-> x = 11/10 : (-3/4)`

   `-> x = -22/15`

   `4) -5/6x + 1/8 = 7/14`

   `-> -5/6x = 7/14 – 1/8`

   `-> -5/6x = 3/8`

   `-> x = 3/8 : (-5/6)`

   `-> x = -9/20`

   `5) 1/2 – 2x = -5/4`

   `-> 2x = 1/2 – (-5/4)`

   `-> 2x = 7/4`

   `-> x = 7/4 : 2`

   `-> x = 7/8`

    

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2. `\text{a.}` `3/7 + 4/7x = -5/14`

   `4/7x=-1/14`

   `x=-1/14:4/7`

   `x=1/8`

   `\text{b.}` `2/5x + 3/10 = -7/15`

   `2/5x=1/6`

   `x=1/6:2/5`

   `x=5/12`

   `\text{c.}` `-3/4x – 2/5 = 7/10`

   `-3/4x=11/10`

   `x=11/10:(-3/4)`

   `x=-22/15`

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