①
19
14 ×9+
19
14 ×19 ,
=
19
14 ×(9+19),
=
19
14 ×28,
=38;
② (
1
2 -
1
3 )÷
2
5 +
2
3 ,
=
1
6 ÷
2
5 +
2
3 ,
=
5
12 +
2
3 ,
=
13
12 ;
③ 36×[(
5
6 -
1
3 )÷3] ,
=36×[
1
2 ÷3],
=36×
1
6 ;
=6;
④
9
4 ÷[(
7
3 -
6
5 )×
3
4 ] ,
=
9
4 ÷[
17
15 ×
3
4 ],
=
9
4 ÷
17
20 ,
=
45
17 .