①
5
8 -
2
5 -
1
5 ,
=
5
8 -(
2
5 +
1
5 ),
=
5
8 -
3
5 ,
=
1
40 ;
②
7
10 -(
3
10 -
1
5 ),
=
7
10 -
3
10 +
1
5 ,
=
2
5 +
1
5 ,
=
3
5 ;
③
8
7 +
7
8 +
4
8 +
6
7 ,
=(
8
7 +
6
7 )+(
7
8 +
4
8 ),
=2+1
3
8 ,
=3
3
8 ;
④1-
3
8 -
1
6 ,
=1-
9
24 -
4
24 ,
=
11
24 ;
⑤6.33+
7
13 +3.77+
6
13 ,
=(6.33+3.77)+(
7
13 +
6
13 ),
=10.1+1,
=11.1.