(1)
5
7 ×
1
4 ×4,
=
5
7 ×(
1
4 ×4) ,
=
5
7 ×1 ,
=
5
7 ;
(2)
11
8 ×
11
26 ×
26
11 ,
=
11
8 ×(
11
26 ×
26
11 ) ,
=
11
8 ×1 ,
=
11
8 ;
(3)
5
2 ×
2
5 ×18.
=(
5
2 ×
2
5 )×18,
=1×18,
=18.
故答案为:4、
26
11 、
5
2 .
(1)
5
7 ×
1
4 ×4,
=
5
7 ×(
1
4 ×4) ,
=
5
7 ×1 ,
=
5
7 ;
(2)
11
8 ×
11
26 ×
26
11 ,
=
11
8 ×(
11
26 ×
26
11 ) ,
=
11
8 ×1 ,
=
11
8 ;
(3)
5
2 ×
2
5 ×18.
=(
5
2 ×
2
5 )×18,
=1×18,
=18.
故答案为:4、
26
11 、
5
2 .