(1)
4
9 ×
1
5 ÷
4
5 ,
=
4
9 ×
1
5 ×
5
4 ,
=
1
9 ;
(2)(15-14×
4
7 )×
8
21 ,
=(15-8)×
8
21 ,
=7×
8
21 ,
=
8
3 ;
(3)
4
5 ÷[(
1
3 +
2
5 )×
4
11 ],
=
4
5 ÷[
11
15 ×
4
11 ],
=
4
5 ÷
4
15 ,
=3;
(4)
2
7 ×
8
9 +
5
7 ×
8
9 ,
=(
2
7 +
5
7 )×
8
9 ,
=1×
8
9 ,
=
8
9 .