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

Toán Lớp 7: Tính : S=3/2+5/4+9/8+17/16+33/32+65/64-7

Toán Lớp 7: Tính : S=3/2+5/4+9/8+17/16+33/32+65/64-7

Comments ( 2 )

  1. 3/2+5/4+9/8+17/16+33/32+65/64-7
    =-1/64
    #nguyentridung65519
    mong bạn cho mình câu trả lời hay nhất + 5sao+cảm ơn!~!

  2. S=3/2+5/4+9/8+17/16+33/32+65/64-7
    =(1+1/2)+(1+1/4)+(1+1/8)+(1+1/16)+(1+1/32)+(1+1/64)-7
    =(1/2+1/4+1/8+1/16+1/32+1/64)+(6-7)
    Đặt A=1/2+1/4+1/8+1/16+1/32+1/64
    2A=1+1/2+1/4+1/8+1/16+1/32
    =>A=2A-A=(1/2+1/4+1/8+1/16+1/32+1/64)-(1+1/2+1/4+1/8+1/16+1/32)
    =>A=1-1/64
    Do đó : S=A+(6-7)=1-1/64=-1/64
     

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