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

Toán Lớp 6: Tính nhanh a) 1994.1994 – 1992.1996 b) (1374.57 + 687.86) : (26.13 + 14.74) c) 2002.2001.2001 – 2001.2002.2002

Toán Lớp 6: Tính nhanh
a) 1994.1994 – 1992.1996
b) (1374.57 + 687.86) : (26.13 + 14.74)
c) 2002.2001.2001 – 2001.2002.2002

Comments ( 1 )

  1.     a.1990.1990-1992.1998
    = 3960100 – 3980016
    = -19916
       b.[1379.57+687.86] chia [26.13+74.14
    = (78603 + 59082) : (338 + 1036)
    = 137685 : 1374
    = 45895/458
        c. 2002.20012001-2001.20022002
    =2002.2001.10001-2001.2002.10001
    =(2002-2002).(2001-2001).(10001-10001)
    =0

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