(1)
7
25 ÷[(
3
4 -
2
5 )×
2
5 ],
=
7
25 ÷[
7
20 ×
2
5 ],
=
7
25 ÷
7
50 ,
=2;
2)0.25×3.2×12.5,
=0.25×(4×0.8)×12.5,
=(0.25×4)×(0.8×12.5),
=1×1,
=1;
(3)22×(
2
11 +
3
16 )×8,
=22×
2
11 ×8+22×
3
16 ×8,
=32+33,
=65;
(4)
9
35 ×
8
11 +
3
35 ×
9
11 ,
=
8
35 ×
9
11 +
3
35 ×
9
11 ,
=(
8
35 +
3
35 )×
9
11 ,
=
11
35 ×
9
11 ,
=
9
35 ;
(5)999
8
9 +99
8
9 +9
8
9 ,
=999
8
9 +99
8
9 +9
8
9 +(
1
9 +
1
9 +
1
9 -
1
3 ),
=(999
8
9 +
1
9 )+(99
8
9 +
1
9 )+(9
8
9 +
1
9 )-
1
3 ,
=1000+100+10-
1
3 ,
=1110-
1
3 ,
=1109
2
3 ;
(6)
1
10 +
1
40 +
1
88 +
1
154 ,
=
1
2×5 +
1
5×8 +
1
8×11 +
1
11×14 ,
=
1
3 ×[(
1
2 -
1
5 )+(
1
5 -
1
8 )+(
1
8 -
1
11 )+(
1
11 -
1
14 )],
=
1
3 ×[
1
2 -
1
5 +
1
5 -
1
8 +
1
8 -
1
11 +
1
11 -
1
14 ],
=
1
3 ×[
1
2 -
1
14 ],
=
1
3 ×
3
7 ,
=
1
7 .