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

Toán Lớp 7: tìm X biết 2^x+2^x+1+2^x+2+2^x+3=240

Toán Lớp 7: tìm X biết
2^x+2^x+1+2^x+2+2^x+3=240

Comments ( 2 )

  1. 2^x +2^(x+1)+2^(x+2)+2^(x+3)=240
    2^x .1+2^x .2 +2^x .2^2 +2^x .2^3=240
    2^x .(1+2+2^2+2^3)=240
    2^x .15=240
    2^x=240:15
    2^x=16
    2^x=2^4
    =>x=4
    Vậy x=4

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    2^x + 2^(x+1) + 2^(x+2) + 2^(x+3) = 240
    2^x . ( 1 + 2 + 4 + 8 ) = 240
    2^x = 240 : 15
    2^x = 16
    2^x = 2^4
    => x = 4 

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

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