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

Toán Lớp 6: 1 – 2 + 3 – 4 + … + 99 – 100 đúng cho 5 sao nhé

Toán Lớp 6: 1 – 2 + 3 – 4 + … + 99 – 100
đúng cho 5 sao nhé

Comments ( 2 )

  1. 1 – 2 + 3 – 4 + . . . + 99 – 100
    =(1 – 2) + (3 – 4) + . . . +( 99 – 100)
    =-1+(-1)+…..+(-1)
    Nhóm mỗi cặp 2 số => Có tất cả : 100:2=50(cặp)
    =-1.50
    =-50
     

  2. 1 – 2 + 3 – 4 + … + 99 – 100
    = ( 1 + 3 + 5 + … + 99 ) – ( 2 + 4 + … + 100)
    = 2500 – 2550
    = -50
     

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

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