①15.28+
12
37 -(
25
37 +4.28 ),
=15.28+
12
37 -
25
37 -4.28,
=15.28-4.28+(
12
37 -
25
37 ),
=11-
13
37 ,
=10
24
37 ;
②(
4
3 -
1
2 )÷(1÷25%-
1
4 ),
=
5
6 ÷(1÷
1
4 -
1
4 ),
=
5
6 ÷(4-
1
4 ),
=
5
6 ÷
15
4 ,
=
5
6 ×
4
15 ,
=
2
9 ;
③ 1
2
3 -[(3.62×
2
15 +6.38÷7
1
2 )×1.82-1
1
3 ×0.82] ,
=1
2
3 -[(3.62×
2
15 +6.38×
2
15 )],
=1
2
3 -[(3.62+6.38)×
2
15 ],
=1
2
3 -[10×
2
15 ],
=1
2
3 -1
1
3 ,
=
1
3 ;
④(1-
4
97 )×
18
19 +
31
97 ÷
19
43 ,
=(1-
4
97 )×
18
19 +
31
97 ×
43
19 ,
=
93
97 ×
18
19 +
31
97 ×
43
19 ,
=
31×3
97 ×
18
19 +
31
97 ×
43
19 ,
=
31
97 ×(3×
18
19 +
43
19 ),
=
31
97 ×(
54
19 +
43
19 ),
=
31
97 ×
97
19 ,
=
31
19 .