tính nhanh nếu có thể : a) (-37) .84 +37 . ( -16 ) b) ( -134 ) + 51.134 + ( -134) .48 c) -43 . ( 1-296) -296 .43 d) 45 . (-24) +(-10) . (-12)

`a)`

`( -37 ) . 84 + 37 . ( -16 )`

`= 37 . [ ( -84 ) + ( -16 ) ]`

`= 37 . ( -100 )`

`= -3700`

`b)`

`( -134 ) + 51 . 134 + ( -134 ) . 48`

`= ( -134 ) . [ 1 + ( -51 ) + 48 ]`

`= ( -134 ) . ( -2 )`

`= 268`

`c)`

`-43 . ( 1 - 296 ) - 296 . 43`

`= 43 . ( -1 ) - ( 43 . 296 - 296 . 43 )`

`= 43 . ( -1 ) - 0`

`= -43`

`d)`

`45 . ( -24 ) + ( -10 ) . ( -12 )`

`= 45 . ( -12 ) . 2 + ( -10 ) . ( -12 )`

`= -12 . 90 + ( -12 ) . ( -10 )`

`= -12 . ( 90 - 10 )`

`= -12 . 80`

`= -960`