(1)2.5×1.25×32,
=2.5×1.25×4×8,
=2.5×4×(125×8),
=10×1000,
=10000;
(2)
13
6 ÷
7
5 -
1
6 ×
5
7 ,
=
13
6 ×
5
7 -
1
6 ×
5
7 ,
=(
13
6 -
1
6 )×
5
7 ,
=2×
5
7 ,
=
10
7 ;
(3)
7
12 ×13+
11
12 ×7 ,
=
7
12 ×13+
7
12 ×11,
=(13+11)×
7
12 ,
=24×
7
12 ,
=14.
(1)2.5×1.25×32,
=2.5×1.25×4×8,
=2.5×4×(125×8),
=10×1000,
=10000;
(2)
13
6 ÷
7
5 -
1
6 ×
5
7 ,
=
13
6 ×
5
7 -
1
6 ×
5
7 ,
=(
13
6 -
1
6 )×
5
7 ,
=2×
5
7 ,
=
10
7 ;
(3)
7
12 ×13+
11
12 ×7 ,
=
7
12 ×13+
7
12 ×11,
=(13+11)×
7
12 ,
=24×
7
12 ,
=14.