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

Toán Lớp 6: tìm x : 226 – 7 ( x+1 ) = 100 (3x-6) . 3 = 3 mũ 4

Toán Lớp 6: tìm x :
226 – 7 ( x+1 ) = 100
(3x-6) . 3 = 3 mũ 4

Comments ( 2 )

  1. 226-7(x+1)=100
    7(x+1)=226-100
    7(x+1)=126
    x+1=126:7
    x+1=18
    x=18-1
    x=17
    Vậy x = 17
    (3x-6).3=3^4
    3x-6=3^4:3
    3x-6=3^3
    3x-6=27
    3x=27+6
    3x=33
    x=33:3
    x=11
    Vậy x = 11.
    $\textit{@Jinz}$
     

  2. Giải đáp:
     $a)226-7.(x+1)=100$
    $⇒ 7.(x+1)=226-100$
    $⇒ 7.(x+1)=126$
    $⇒ x+1=126:7$
    $⇒ x+1=18$
    $⇒ x=18-1$
    $⇒x=17$
    $Vậy$ $x=17$
    $b) (3x-6).3=3^4$
    $⇒ 3x-6= 3^{4-1}$
    $⇒ 3x-6= 27$
    $⇒ 3x=33$
    $⇒ x=11$ 
    $Vậy$ $x=11$
     

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

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