Tìm x : y X nhân 3/4 cộng 2/5 =1 Y chia 2/3 trừ 2/5 =1

Question

Tìm x : y
X nhân 3/4 cộng 2/5 =1
Y chia 2/3 trừ 2/5 =1

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Bơ 5 years 2021-04-18T22:40:44+00:00 2 Answers 172 views 0

Answers ( )

  1. Edana
    0
    2021-04-18T22:42:01+00:00
    Reply

    Giải thích các bước giải:

    `x xx3/4+2/5=1`
    `=>x xx3/4=1-2/5`
    `=>x xx3/4=5/5-2/5`
    `=>x xx3/4=3/5`
    `=>x=3/5:3/4`
    `=>x=3/5xx4/3`
    `=>x=4/5`
    Vậy `x=4/5`
    `y:2/3-2/5=1`
    `=>y:2/3=1+2/5`
    `=>y:2/3=5/5+2/5`
    `=>y:2/3=7/5`
    `=>y=7/5xx2/3`
    `=>x=14/15`
    Vậy `x=14/15`

  2. Maris
    0
    2021-04-18T22:42:24+00:00
    Reply

    `x xx 3/4 + 2/5 =1`

    ` x xx 3/4 = 1 -1/5`

    `x  xx 3/4= 3/5`

    ` x xx = 3/5 : 4/5`

    `x xx = 3/5 . 5/4`

    `x xx = 3/4`

    `y : 2/3 – 2/5 =1`

    `y : 2/3= 1 + 2/5`

    `y: 2/3 =7/5`

    `y = 7/5 . 3/2`

    `y= 21/10`

    Từ đó `x:y = 3/4 : 21/10 = 3/4 . 10/21 = 5/14`

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