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

Toán Lớp 6: c)52.(-18)+26.(-64) d)34.(-29)+17.38

Toán Lớp 6: c)52.(-18)+26.(-64) d)34.(-29)+17.38

Comments ( 2 )

  1. c) 52 . ( – 18 ) + 26 . ( – 64 )
    = ( – 52 ) . 18 + 26 . ( – 2 ) . 32
    = ( – 52 ) . 18 + ( – 52 ) . 32
    = ( – 52 ) . ( 18 + 32 )
    = ( – 52 ) . 50
    =- 2600
    b) 34 . ( – 29 ) + 17 . 38
    = 34 . ( – 29 )+ 17 . 2 . 19
    = 34 . ( – 29 ) + 34 . 19
    = 34 . [ ( – 29 ) + 19 ]
    = 34 . ( – 10 )
    = – 340

  2. Giải đáp:
    c) 52.(-18)+26.(-64)
    = 26 . 2 . (-18) + 26 . (-64)
    = 26 . (-36) + 26 . (-64)
    = 26 . (-36 – 64)
    = 26 . (-100)
    = -2600
    d) 34.(-29)+17.38
    = 17 . 2 . (-29) + 17 . 38
    = 17 . (-58) + 17 . 38
    = 17 . (-58 + 38)
    = 17 . (-20)
    = -340

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