计算下列各题,能简算的要简算. 1110÷[56×(2/3-3/7)]= 1999+1999×999= 378+864÷24×7=

问题描述:

计算下列各题,能简算的要简算.
1110÷[56×(

2
3
-
3
7
)]=
1999+1999×999=
378+864÷24×7=

(1)1110÷[56×(

2
3
-
3
7
)]
=1110÷[56×
5
21
]
=1110÷
40
3

=
333
4

(2)1999+1999×999
=1999+1999×999
=1999×(1+999)
=1999×1000
=1999000;
(3)378+864÷24×7
=378+36×7
=378+252
=630.