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

Toán Lớp 6: B=1+2-3-4+5+6-7-8+9+10–.-99-100

Toán Lớp 6: B=1+2-3-4+5+6-7-8+9+10-…..-99-100

Comments ( 2 )

  1. B = 1 + 2 – 3 – 4 + 5 + 6 – 7 – 8 + 9 + 10 -…..- 99 -100
    B = ( 1 + 2 – 3- 4 ) + ( 5 + 6 – 7 – 8  ) – … ( 97 + 98 – 99 – 100 )
    B = \underbrace{(-4) + ( -4 ) + … ( -4 ) }_{25}
    B = 25 * ( -4 ) 
    = -100

  2. B=1+2-3-4+5+6-7-8+9+10-…..-99-100
    B=(1+2-3-4)+(5+6-7-8)+(9+10-11-12)+………………………..+( 97 + 98 – 99 – 100 )
    B=(-4)+(-4)+(-4)+………………………….+(-4) (có 25 cặp số )
    B=(-4).25
    B=-100
    Vậy B=-100
     

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

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