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

Toán Lớp 6: a, 2^x+1-17=15 b, (x+1)^3-2,3^2=9 Giúp mình hai câu này với

Toán Lớp 6: a, 2^x+1-17=15
b, (x+1)^3-2,3^2=9
Giúp mình hai câu này với

Comments ( 2 )

  1. a)2^x+1-17=15
    2^x+1=15+17
    2^x+1=32
    2^x+1=2^5
    2^x=2^5-1
    2^x=2^4
    ⇒x=4
    b(x+1)^3-2.3^2=9
    (x+1)^3-18=9
    (x+1)^3=9+18
    (x+1)^3=27
    (x+1)^3=3^3
    ⇒x+1=3
    ⇒x=3-1
    ⇒x=2
    vậy x=2

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