A 25+(x–25).5=5. 4 mũ 2 B 3.(x+3)+19=7 mũ 2 C x mũ 2=81 d x=[(1800+600):30]=560:(315-35)

Question

A 25+(x–25).5=5. 4 mũ 2
B 3.(x+3)+19=7 mũ 2
C x mũ 2=81
d x=[(1800+600):30]=560:(315-35)

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Latifah 1 year 2020-10-21T13:54:18+00:00 2 Answers 105 views 0

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    0
    2020-10-21T13:55:18+00:00

    Đáp án:

     

    Giải thích các bước giải:

     

    a-25-25-5-5-4-mu-2-b-3-3-19-7-mu-2-c-mu-2-81-d-1800-600-30-560-315-35

    0
    2020-10-21T13:55:27+00:00

    A,25+(x-25).5=5. 4²

    ⇔25+(x-25).5=5.4.4

    25+(x-25).5=20.4

    25+(x-25).5=80

    (x-25).5=80-25

    (x-25).5=55

    x-25=55:5

    x-25=11

    x=11+25

    x=36

    B,3.(x+3)+19=7²

    ⇔3.(x+3)+19=7.7

    3.(x+3)+19=49

    3.(x+3)=49-19

    3.(x+3)=30

    x+3=30:3

    x+3=10

    x=10-3

    x=7

    C,x²=81

    ⇔x.x=81

    x=9

    D,x:[(1800+600):30]=560:(315-35)

    x:[2400:30]=560:280

    x:80=2

    x=80.2

    x=160

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