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

Toán Lớp 6: 300 ; [ 115 – 5 * ( 4 mũ 2 + 1 ) câu 2 : ( 4x – 3 ) * 2 mũ 3 = 72

Toán Lớp 6: 300 ; [ 115 – 5 * ( 4 mũ 2 + 1 )
câu 2 : ( 4x – 3 ) * 2 mũ 3 = 72

Comments ( 2 )

  1. 1, 300 : [115 – 5. (4^2 + 1)]
    = 300 : [115 – 5. (16 + 1)]
    = 300 : [115 – 5. 17]
    = 300 : [115 – 85]
    = 300 : 30
    = 10
    2, (4x – 3). 2^3 = 72
    => 4x – 3 = 72 : 2^3
    => 4x – 3 = 72 : 8
    => 4x – 3 = 9
    => 4x = 9 + 3
    => 4x = 12
    => x = 12 : 4
    => x = 3
    Vậy x = 3
     

  2. Lời giải chi tiết:
    Câu 1:
    300:[115-5xx(4^2+1)
    =300:[115-5xx(16+1)]
    =300:(115-5xx17)
    =300:(115-85)
    =300:30
    =10
    Câu 2:
    (4x-3)xx2^3=72
    =>(4x-3)xx8=72
    =>4x-3=72:8
    =>4x-3=9
    =>4x=9+3
    =>4x=12
    =>x=12:4
    =>x=3
    Vậy x=3
    @uniquetimehunter

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

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