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

Toán Lớp 6: a.2^x=16 b.2^x*16=1024 C.64*4^x=16 d.3^x*3=243

Toán Lớp 6: a.2^x=16
b.2^x*16=1024
C.64*4^x=16
d.3^x*3=243

Comments ( 2 )

  1. a) $2^{x}$ =16
      $2^{x}$  = $2^{4}$ 
    →x=4
    b) $2^{x}$ x 16= 1024
        $2^{x}$        = 1024:16
        $2^{x}$        = $2^{6}$
    →x=6
    c) không làm được
    d) $3^{x}$ x 3= 243
         $3^{x}$     = 243:3
         $3^{x}$     = $3^{4}$
    →x=4
     

  2. a)2^x=16
    =>2^x=2^4
    =>x=4
    b)2^x .16=1024
    =>2^x=1024:16
    =>2^x=64
    =>2^x=2^6
    =>x=6
    c) Sai đề
    d)3^x .3=243
    =>3^x=243:3
    =>3^x=81
    =>3^x=3^4
    =>x=4
     

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