题目内容

怎样简便就怎样做.
6
7
-
3
4
)÷
1
28
(9×
5
6
-
73
10
)÷
2
5
3-
3
2
×
10
21
-
2
7
10÷
5
9
+
1
6
×4.
(1)(
6
7
-
3
4
)÷
1
28

=(
6
7
-
3
4
)×28,
=
6
7
×28-
3
4
×28,
=24-21,
=3;

(2)(9×
5
6
-
73
10
)÷
2
5

=(
15
2
-
73
10
)÷
2
5

=
1
5
÷
2
5

=
1
2


(3)3-
3
2
×
10
21
-
2
7

=3-
5
7
-
2
7

=3-(
5
7
+
2
7
),
=3-1,
=2;

(4)10÷
5
9
+
1
6
×4,
=18+
2
3

=18
2
3
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