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

Toán Lớp 6: a ) 4 . (x – 5 ) – 2^3 = 2^4 . 3 nhanh giúp em

Toán Lớp 6: a ) 4 . (x – 5 ) – 2^3 = 2^4 . 3
nhanh giúp em

Comments ( 2 )

  1. a) 4.(x-5)-2^3=2^{4}.3
    =>4.(x-5)-8=16.3
    =>4.(x-5)-8=48
    =>4.(x-5)=48+8
    =>4.(x-5)=56
    =>x-5=56:4
    =>x-5=14
    =>x=14+5
    =>x=19
    Vậy x=19
     

  2.  a, 4. (x – 5) – 2^3 = 2^4. 3
    ⇒ 4. (x – 5) – 8 = 16. 3
    ⇒ 4. (x – 5) – 8 = 48
    ⇒ 4. (x – 5) = 48 + 8
    ⇒ 4. (x – 5) = 56
    ⇒ x – 5 = 56 : 4
    ⇒ x – 5 = 14
    ⇒ x = 14 + 5 = 19
    Vậy x = 19

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