`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`

Question

`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`

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Hadley 2 tuần 2021-08-31T14:01:18+00:00 2 Answers 3 views 0

Answers ( )

    0
    2021-08-31T14:02:21+00:00

    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`

    0
    2021-08-31T14:02:47+00:00

    *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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