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

Toán Lớp 6: Tính: A=1+(-2)+(-3)+4+5+(-6)+(-7)+8+…+99-100-101+102+103 Em mong có người trả lời ạ

Toán Lớp 6: Tính: A=1+(-2)+(-3)+4+5+(-6)+(-7)+8+…+99-100-101+102+103
Em mong có người trả lời ạ

Comments ( 2 )

  1. A = 1 + ( – 2 ) + ( – 3 ) + 4 + 5 + ( – 6 ) + ( – 7 ) + 8 + …. + 99 – 100 – 101 + 102 + 103
    A = [ 1 + ( – 2 ) + ( – 3 ) + 4 ] + [ 5 + ( – 6 ) + ( – 7 ) + 8 ] + …. + [ 99 – 100 – 101 + 102 ] + 103
    A = 0 + 0 + …. + 0 + 103
    A = 103
    Vậy , A = 103 .

  2. A = 1 + (-2) + (-3) + 4 + 5+ (-6) + (-7) + 8 +…+ 99 – 100 – 101 + 102 + 103
    = 1 – 2 – 3 + 4 + 5 – 6 – 7+8 +…+ 99 – 100 – 101 + 102 + 103
    = (1 – 2 – 3 + 4) + (5 – 6 – 7 +8) +…+ (99 – 100 – 101 + 102) + 103
    = 0 + 0 + …+ 0 + 103
    = 103
     

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