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

Toán Lớp 6: A= x – 14 – 75 +y biết x = -15 và y = 14 C= x – y +2016 -32 + y – x biết x= 1234 ,y= -3506

Toán Lớp 6: A= x – 14 – 75 +y biết x = -15 và y = 14
C= x – y +2016 -32 + y – x biết x= 1234 ,y= -3506

Comments ( 2 )

  1. A = x-14-75+y
    Với x=-15 ; y=14
    => (-15) – 14 – 75 + 14
    => (-29) – 75 + 14
    => (-104) + 14
    => -90
    C = x -y + 2016 – 32 + y – x
    Với x=1234 ; y=-3506
    => 1234 – (-3056) + 2016 – 32 + (-3056) – 1234
    => 1234+3056+2016-32+(-3056)-1234
    => (1234-1234) + [3056+(-3056) + 2016 – 32
    => 0+0+2016-32
    => 2016-32
    => 1984

  2. A = x – 14 – 75 + y
    A = ( – 15) – 14 – 75 + 14
    A = [( – 14) + 14) + ( – 15) – 75
    A = 0 + (-90)
    A = ( – 90)
    C = x – y + 2016 – 32 + y – x
    C = 1234 – ( – 3506) + 2016 – 32 + ( – 3506) – 1234
    C = 1234 + 3506 + 2016 – 32 – 3506 – 1234
    C = ( 1234 – 1234) + ( 3506 – 3506) + 2016 – 32
    C = 0 + 0 + 1984
    C = 1984
     

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