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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: x-(-15)=-2005 ; 2x+3=5^4:5^2; x-2+3=12

Toán Lớp 6: x-(-15)=-2005 ; 2x+3=5^4:5^2; x-2+3=12

Comments ( 2 )

  1. Giải đáp:
    1)
    x-(-15)=-2005
    ⇒x+15=-2005
    ⇒x=-2005-15
    ⇒x=-2020
    Vậy x=-2020
    2)
    2x+3=5^(4):5^(2)
    ⇒2x+3=5^(4-2)
    ⇒2x+3=5^2
    ⇒2x+3=25
    ⇒2x=25-3
    ⇒2x=22
    ⇒x=11
    Vậy x=11
    3)
    x-2+3=12
    ⇒x+1=12
    ⇒x=12-1
    ⇒x=11
    Vậy x=11

  2. Giải đáp:
    @ x – ( -15 ) = -2005
    -> x + 15 = -2005
    -> x = -2005 – 15 = -2020
    Vậy x = -2020
    @ 2x+3 = 5^4 : 5^2
    -> 2x + 3 = 5^2
    -> 2x + 3 = 25
    -> 2x = 22
    -> x = 22 : 2 = 11
    Vậy x = 11
    @ x – 2 + 3 = 12
    -> x – 2 = 12 – 3 = 9
    -> x = 9 + 2 = 11
    Vậy x = 11
     

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222-9+11+12:2*14+14 = ? ( )