x+11/20 = 5/30 -0,7.x=3$\frac{1}{2}$ +1$\frac{2}{5}$

Question

x+11/20 = 5/30
-0,7.x=3$\frac{1}{2}$ +1$\frac{2}{5}$

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Rose 1 năm 2021-09-02T09:50:40+00:00 2 Answers 7 views 0

Answers ( )

    0
    2021-09-02T09:51:45+00:00

    `x+11/20 = 5/30`

    `=> x = 5/30 – 11/20`

    `=> x = -23/60`

    `(-0,7).x= 3“1/2` + `1“2/5`

    `=> (-0,7).x= 3,5 + 1,4`

    `=> (-0,7).x = 4,9`

    `=> x = 4,9 : (-0,7)`

    `=> x = -7`

    (Chúc bạn học tốt)

    0
    2021-09-02T09:52:14+00:00

    Giải thích các bước giải:

    ${*,}$ `x+11/20=5/30`

    `<=>x+11/20=1/6`

    `<=>x=1/6-11/20`

    `<=>x=10/60-33/60`

    `<=>x=-23/60`

    ${*,}$ `-0,7xx x=3 1/2+1 2/5`

    `<=>-7/10xx x=7/2+8/5`

    `<=>-7/10xx x=35/10+16/10`

    `<=>-7/10xx x=51/10`

    `<=>x=51/10:(-7/10)`

    `<=>x=51/10.(-10/7)`

    `<=>x=-51/7`

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