100+98+96+…+2-97-95-…-1 1+2-3-4+5+6-7-8+9+10-11-12+…-299_300+301+302

100+98+96+…+2-97-95-…-1 1+2-3-4+5+6-7-8+9+10-11-12+…-299_300+301+302

0 thoughts on “100+98+96+…+2-97-95-…-1 1+2-3-4+5+6-7-8+9+10-11-12+…-299_300+301+302”

  1. Đáp án:

     

    Giải thích các bước giải:

    100+98+96+…+2-97-95-…-1

    =100+(98-97)+(96-95)+…+(4-3)+(2-1)
    =100+1+1+1+…+1+1
    ​=144

    1+2-3-4+5+6-7-8+9+10-11-12+…..-299-300+301+302
    =1+(2-3)+(-4+5)+(6-7)+(-8+9)+(10-11)+… +(-300+301)+302
    = 1-1+1-1+1-1+…-1+302
    = 302

    Reply

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