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

Toán Lớp 5: B=2/3+2/6+2/12+2/24+2/48+2/96+2/192 tính nhanh nha ):<

Toán Lớp 5: B=2/3+2/6+2/12+2/24+2/48+2/96+2/192
tính nhanh nha ):<

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    B=2/3+2/6+2/12+2/24+2/48+2/96+2/192
    B=2/3+1/3+1/6+1/12+1/24+1/48+1/96
    B=$\frac{64+32+16+8+4+2+1}{96}$ 
    B=$\frac{127}{96}$ 

  2. Answer
    B = 2/3 + 2/6 + 2/12 + 2/24 + 2/48 + 2/96 + 2/192
    B = 2 . (1/3 + 1/6 + 1/12 + 1/24 + 1/48 + 1/96 + 1/192)
    B = 2 . (1/{1.3} + 1/{2.3} + 1/{3.4} + 1/{4.6} + 1/{6.8} + 1/{8.12} + 1/{12.16})
    B = 2/3 + 2 . (1/2 – 1/4) + 2 . (2/{4.6} + 2/{6.8}) : 2 + 1/2 . (4/{8.12} + 4/{12.16}) 
    B = 2/3 + 2 . 1/4 + 2 . 1/8 : 2 + 1/2 . 1/16 
    B = 2/3 + 1/2 + 1/4 : 2 + 1/32 
    B = 2/3 + 1/2 + 1/8 + 1/32 
    B = 7/6 + 1/8 + 1/32 
    B = 31/24 + 1/32 
    B = 127/96 
    $\text{Vậy}$ B = 127/96 
     

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

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