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

Toán Lớp 6: cho mình hỏi (-85)-(-17)+(-15) bằng bao nhiêu?

Toán Lớp 6: cho mình hỏi (-85)-(-17)+(-15) bằng bao nhiêu?

Comments ( 2 )

  1. ( – 85) – ( – 17) + ( – 15)
    = ( – 85) + 17 + ( – 15)
    = [( – 85) + ( – 15)] + 17
    = – 100 + 17
    = – ( 100 – 17)
    = – 83
     

  2. ( – 85 ) – ( – 17 ) + ( -15 )
    $\\$
    = [ ( – 85 ) + ( – 15 ) ] – ( – 17 )
    $\\$
    = ( – 100 ) + 17
    $\\$
    = – 83
    $\\$

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