a, `2x/-9` `=` `10/9` b, `-5/2x` `=` `20/28`

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a, `2x/-9` `=` `10/9`
b, `-5/2x` `=` `20/28`

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    Đáp án`+`Giải thích các bước giải:

     `a, {2x}/ -9 = 10/91`

    `2x.9=10.(-9)`

    `2x. 9 = -90`

    `2x= -90 :91`

    `2x= -90/91`

    `x=-90/91 :2`

    `x=-45/91`

    Vậy `x= -45/91`

    `b, -5/ {2x}= 20/28`

    `2x. 20=-5.28`

    `2x.20=-140`

    `2x= -140:20`

    `2x= -7`

    `x=-7:2`

    `x=-7/2`

    Vậy `x=-7/2`

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