(1)
2
9 ×
5
11 ×27×33,
=(
2
9 ×27)×(
5
11 ×33),
=6×15,
=90;
(2)
2
7 ×(1÷
3
4 -
3
4 ÷1),
=
2
7 ×(
4
3 -
3
4 ),
=
2
7 ×
7
12 ,
=
1
6 ;
(3)2006×
2004
2005 ,
=(2005+1)×
2004
2005 ,
=2005×
2004
2005 +1×
2004
2005 ,
=2004+
2004
2005 ,
=2004
2004
2005 ,
(4) 3
3
4 ×2.6+ 1
2
5 ×3.75,
=3.75×2.6+1.4×3.75,
=3.75×(2.6+1.4),
=3.75×4,
=15;
(5)
19
43 ×34+53×
19
43 -
19
43 ,
=
19
43 ×(34+53-1),
=
19
43 ×86,
=38;
(6)
5
6 ×
1
10 + 1
1
2 ×0.1+ 2
2
3 ÷10,
=
5
6 ×
1
10 + 1
1
2 ×
1
10 + 2
2
3 ×
1
10 ,
=(
5
6 + 1
1
2 + 2
2
3 )×
1
10 ,
=5×
1
10 ,
=
1
2 .