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

Toán Lớp 6: Tìm x Câu 1: Tìm x a) 3. ( x + 6 ) – 5^3 = 2. ( x – 8 ) – 1 b) ( 2 + x )^3 – 23 = 41

Toán Lớp 6: Tìm x
Câu 1: Tìm x
a) 3. ( x + 6 ) – 5^3 = 2. ( x – 8 ) – 1 b) ( 2 + x )^3 – 23 = 41

Comments ( 2 )

  1. Lời giải chi tiết:
    a) 3.(x+6)-5^3=2.(x-8)-1
    =>3x+18-125=2x-16-1
    =>3x-107=2x-17
    =>3x-2x=-17+107
    =>x=90
    Vậy x=90
    b) (2+x)^3-23=41
    =>(2+x)^3=41+23
    =>(2+x)^3=64
    =>(2+x)^3=4^3
    =>2+x=4
    =>x=4-2
    =>x=2
    Vậy x=2

  2. ${ a) 3 . (x + 6) – 5^3 = 2 . (x – 8) – 1 }$
    ${ ⇒ 3x + 18 – 125 = 2x – 16 – 1 }$
    ${ ⇒ 3x – 107 = 2x – 17 }$
    ${ ⇒ 3x – 107 – 2x + 17 = 0 }$
    ${ ⇒ x – 90 = 0 }$
    ${ ⇒ x = 90 }$
    Vậy ${ x = 90 }$
    ${ b) (2 + x)^3 – 23 = 41 }$
    ${ ⇒ (2 + x)^3 = 64 }$
    ${ ⇒ (2 + x)^3 = 4^3 }$
    ${ ⇒ 2 + x = 4 }$
    ${ ⇒ x = 2 }$
    Vậy ${ x = 2 }$
     

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