脱式计算.(友情提醒:有的可以简算) 4000-3456÷32×5 3.68-3.6×0.2+0.18  48×9.9+48×0.1 (1-3/4)÷0.25×4   (6-6×2/3)÷12   2÷[7/12+( 5/6-5/12)].

问题描述:

脱式计算.(友情提醒:有的可以简算)
4000-3456÷32×5       
3.68-3.6×0.2+0.18        48×9.9+48×0.1
(1-
3
4
)÷0.25×4       
(6-6×
2
3
)÷12        
2÷[
7
12
+( 
5
6
-
5
12
)].

(1)4000-3456÷32×5,
=4000-108×5,
=4000-540,
=3460;
(2)3.68-3.6×0.2+0.18,
=3.68+0.18-0.72,
=3.86-0.72,
=3.14;
(3)48×9.9+48×0.1,
=48×(9.9+0.1),
=48×10,
=48;
(4)(1-

3
4
)÷0.25×4,
=
1
4
÷
1
4
×4,
=1×4,
=4;
(5)(6-6×
2
3
)÷12,
=(6-4)÷12,
=2÷12,
=
1
6

(6)2÷[
7
12
+(
5
6
5
12
)],
=2÷[
7
12
+(
10
12
-
5
12
)],
=2÷[
7
12
+
5
12
],
=2÷1,
=2.