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

Toán Lớp 5: 4/1,5+4/5,9+4/9,13+…+4/97,101=

Toán Lớp 5: 4/1,5+4/5,9+4/9,13+…+4/97,101=

Comments ( 2 )

  1. Answer
    4/{1xx5} + 4/{5xx9} + 4/{9xx13} + … + 4/{97xx101}
    = 1 – 1/5 + 1/5 – 1/9 + 1/9 – 1/13 + … + 1/97 – 1/101
    = 1 – 1/101
    = 101/101 – 1/101
    = {101-1}/101
    = 100/101
     

  2. 41×5+45×9+49×13+…+497×101
    =1-15+15-19+19-113+…+197-1101
    =1-1101
    =101101-1101
    =101-1101

    toan-lop-5-4-1-5-4-5-9-4-9-13-4-97-101

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