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

Toán Lớp 5: tìm x (x +1/2 ) + (x +1/4 ) + (x + 1/8 ) + (x +1/16 ) = 1

Toán Lớp 5: tìm x (x +1/2 ) + (x +1/4 ) + (x + 1/8 ) + (x +1/16 ) = 1

Comments ( 2 )

  1. Giải đáp:
     X=1/46
    Lời giải và giải thích chi tiết:
     ( x+x+x+x ) + ( 1/2 + 1/4 + 1/8 +1/6 ) = 1
     4x + 15/16=1
    4x = 1 – 15/16
    4x = 1/16
    x = 1/16 : 4
    x= 1/46

  2. ( x + $\frac{1}{2}$ ) + ( x + $\frac{1}{4}$ ) + ( x + $\frac{1}{8}$ ) + ( x + $\frac{1}{16}$ ) = 1
    ⇒ ( x + x + x + x ) + ( $\frac{1}{2}$ + $\frac{1}{4}$ + $\frac{1}{8}$ + $\frac{1}{16}$ ) = 1
    ⇒ ( 4 . x ) + ( $\frac{8}{16}$ + $\frac{4}{16}$ + $\frac{2}{16}$ + $\frac{1}{16}$ ) = 1
    ⇒ ( 4 . x ) + $\frac{15}{16}$ = 1
    ⇒ ( 4. x ) = 1 – $\frac{15}{16}$
    ⇒ ( 4 . x ) = $\frac{1}{16}$
    ⇒ x = $\frac{1}{16}$ : 4
    ⇒ x = $\frac{1}{64}$

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