(1)
5
6 ×
9
4 -
7
3 ×
3
8
=
15
8 -
7
8 ,
=1;
(2)8-3
1
7 -2
3
7 ,
=8-(3
1
7 +2
3
7 ),
=8-5
4
7 ,
=2
3
7 ;
(3)3.2×
3
8 ÷1
2
5
=1.2×
5
7 ,
=
6
7 ;
(4)2.75-1
5
6 +3
1
4 -2
1
6 ,
=(2.75+3.25)-(1
5
6 +2
1
6 ),
=6-4,
=2.
(1)
5
6 ×
9
4 -
7
3 ×
3
8
=
15
8 -
7
8 ,
=1;
(2)8-3
1
7 -2
3
7 ,
=8-(3
1
7 +2
3
7 ),
=8-5
4
7 ,
=2
3
7 ;
(3)3.2×
3
8 ÷1
2
5
=1.2×
5
7 ,
=
6
7 ;
(4)2.75-1
5
6 +3
1
4 -2
1
6 ,
=(2.75+3.25)-(1
5
6 +2
1
6 ),
=6-4,
=2.