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

Toán Lớp 7: 12x+3.7³=7³.x-4.3² Cần giải chỉ tiết.

Toán Lớp 7: 12x+3.7³=7³.x-4.3²
Cần giải chỉ tiết.

Comments ( 2 )

  1. 12x+3.7^3=7^3 x-4.3^2
    =>12x+3.343=343x-4.9
    =>12x+1029=343x-36
    =>12x+1029+36=343x
    =>12x+1065=343x
    =>12x+343x=1065
    =>355x=1065
    =>x=1065:355
    =>x=3
    Vậy x=3

  2. 12x + 3 . 7^{3} = 7^{3} . x – 4 . 3^{2}
    => 12x + 3 . 343 = 343 . x – 36
    => 12x + 1029 + 36 = 343 . x
    => 12x + 1065 = 343 . x
    => 343x + 12x = 1065
    => 355x = 1065
    => x = 1065 : 355
    => x = 3
     

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

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