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

TRẢ LỜI

1. 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

   Trả lời
2. 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

   Trả lời