a, 149-4.(x+25)=49 b, [ 2.(x+5)-31].4=52

Question

a, 149-4.(x+25)=49
b, [ 2.(x+5)-31].4=52

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Dulcie 1 year 2020-11-27T05:19:33+00:00 2 Answers 44 views 0

Answers ( )

    0
    2020-11-27T05:20:58+00:00

    Đáp án:

    ` 149 – 4(x+25) = 49`

    ` => -4(x+25) = 100`

    ` => x +25 = -25`

    ` => x = -25-25`

    ` => x = -50`

    Vậy ` x = -50`

    *****

    ` [ 2(x+5) – 31] . 4 = 52`

    ` => [2 (x+5) – 31] =  13`

    ` => 2(x+5) = 13 +31`

    ` => 2(x+5) = 44`

    ` => x +5 = 22`

    ` => x= 17`

     

    0
    2020-11-27T05:21:18+00:00

    Đáp án:

    `149-4.(x+25)=49`

          ` 4.(x+25)=149-49`

           `4.(x+25)=100`

             `  x+25=100:4`

               `x+25=25`

             ` x=25-25`

              `x=0`

    `[ 2.(x+5)-31].4=52`

    `[2.(x+5)-31]=52:4`

    `[2.(x+5)-31]=13`

    `2.(x+5)=13+31`

    `2.(x+5)=44`

    `(x+5)=44:2`

    `(x+5)=22`

    `x+5=22-5`

    `x=17`

     

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )