`8/7`.x=`29/9`:`29/56` `1/5`:x=`1/5`+`1/7` `2/5`+`3/4`:x=`-1/2` `1/2`x+`3/5`x=`-2/3`

0 bình luận về “`8/7`.x=`29/9`:`29/56` `1/5`:x=`1/5`+`1/7` `2/5`+`3/4`:x=`-1/2` `1/2`x+`3/5`x=`-2/3`”

1. Đáp án:

   Giải thích các bước giải:

   `a)`

   `8/7x=29/9:29/56`

   `=>8/7x=56/9`

   `=>x=8/7:56/9`

   `=>x=9/49`

   Vậy `x=9/49`

   `b)`

   `1/5:x=1/5+1/7`

   `=>1/5:x=12/35`

   `=>x=1/5:12/35`

   `=>x=7/12`

   Vậy `x=7/12`

   `c)`

   `2/5+3/4:x=-1/2`

   `=>3/4:x=-1/2-2/5`

   `=>3/4:x=-9/10`

   `=>x=3/4:-9/10`

   `=>x=-5/6`

   Vậy `x=-5/6`

   `d)`

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

   `=>11/10x=-2/3`

   `=>x=-2/3:11/10`

   `=>x=-20/33`

   Vậy `x=-20/33`

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2. *Lời giải :

   8/7 . x = 29/9 : 29/56

   -> 8/7 . x = 56/9

   -> x = 56/9 : 8/7

   -> x = 49/9

   Vậy x = 49/9

   1/5 : x = 1/5 + 1/7

   -> 1/5 : x = 12/35

   -> x = 1/5 : 12/35

   -> x =7/12

   Vậy x = 7/12

   2/5 + 3/4 : x = -1/2

   -> 3/4 : x = -1/2 – 2/5

   -> 3/4 : x= -9/10

   -> x = 3/4 : -9/10

   -> x = -5/6

   Vậy x = -5/6

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

   -> (1/2 + 3/5)x = -2/3

   -> 11/10x = -2/3

   -> x = -2/3 : 11/10

   -> x = -20/33

   Vậy x = -20/33

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