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

Toán Lớp 5: tìm x biết : a) ( x + 0,5 ) + ( 0,25) + ( x + 0,125) + ( x + 0,0625) = 1

Toán Lớp 5: tìm x biết :
a) ( x + 0,5 ) + ( 0,25) + ( x + 0,125) + ( x + 0,0625) = 1

Comments ( 2 )

  1. (x+0,5)+(0,25)+(x+0,125)+(x+0,0625)=1
             ==>x+1/2+1/4+x+1/8+x+1/16=1
             ==>  3x+(1/2+1/4+1/8+1/16)  =1
            ==>3x+(8/16+4/16+2/46+1/16)=1
              ==>                 x+15/16             =1
            ==>                      x                      =1-15/16
            ==>                      x                       =1/16 

  2. ( x + 0,5 ) + ( 0,25 ) + ( x + 0,125 ) + ( x + 0,0625 ) = 1
    ( x + x + x ) + ( 0,5 + 0,25 + 0,125 + 0,0625 ) = 1
    3x + 0,9375 = 1
    3x = 1 – 0,9375
    3x = 0,0625
    x = $\dfrac{0,0625}{3}$
    x = $\dfrac{1}{48}$
     Đáp số : x = $\dfrac{1}{48}$
     

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

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