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

Toán Lớp 6: bài 1 a)[43-(56-x)]*12=384 b)3 mũ x *2+15=33

Toán Lớp 6: bài 1
a)[43-(56-x)]*12=384
b)3 mũ x *2+15=33

Comments ( 2 )

  1. a) [43-(56- x)] x 12=384
    [43-(56- x)] = 384 : 12
    [43-(56- x)] = 32
    56 – x = 43 – 32
    56 – x = 11
    x = 56 -11
    x = 45
    b) 3^x x 2+15=33
    3^x x 2 = 33 – 15
    3^x x 2 = 18
    3^x = 18 : 2
    3^x = 9 
    → 3^2 = 9
    ⇒ x = 2 
     

  2. a,[43-(56-x)]xx12=384
    43-(56-x)=384:12
    43-(56-x)=32
    56-x=43-32
    56-x=11
    x=56-11
    x=45
    b,3^x xx 2 + 15 = 33
    3^x xx 2 = 33-15
    3^x xx 2 = 18
    3^x = 18 : 2
    3^x = 9
    3^x = 3^2
    ⇒x = 2

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

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