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

Toán Lớp 6: Tính nhanh a) (-27) x 39 + (-61) x 27

Toán Lớp 6: Tính nhanh
a) (-27) x 39 + (-61) x 27

Comments ( 2 )

  1. (-27) xx 39 + (-61) xx 27
    = 27 xx (-39) + (-61) xx 27
    = 27 xx [ (-39) + (-61)]
    = 27 xx (-100)
    = -2700

  2. a) (-27) xx 39 + (-61) xx 27
    = 27 xx [(-39) + (-61)]
    = 27 xx (-100)
    = -2700

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