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

Toán Lớp 6: (25-2x) ³:5-3 ²=4 ² , bài 2 tìm x

Toán Lớp 6: (25-2x) ³:5-3 ²=4 ² , bài 2 tìm x

Comments ( 2 )

  1. Lời giải chi tiết:
    (25-2x)^3:5-3^2=4^2
    =>(25-2x)^3:5=4^2+3^2
    =>(25-2x)^3:5=16+9
    =>(25-2x)^3:5=25
    =>(25-2x)^3=25.5
    =>(25-2x)^3=125
    =>(25-2x)^3=5^3
    =>25-2x=5
    =>2x=25-5
    =>2x=20
    =>x=20:2
    =>x=10
    Vậy x=10

  2. (25 – 2x)^3 : 5 – 3^2 = 4^2
    => (25 – 2x)^3 : 5 – 9 = 16
    => (25 – 2x)^3 : 5 = 16 +9
    => (25 – 2x)^3 : 5 = 25
    => (25 – 2x)^3 = 25 . 5
    => (25 – 2x)^3 = 125
    => (25 – 2x)^3 = 5^3
    => 25 – 2x = 5
    => 2x = 25 – 5
    => 2x = 20
    => x = 20 : 2
    => x = 10
    Vậy x = 10

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