题目内容

下面各题怎样简便怎样算.
①10944÷36×25-758
②132.5-18÷7.5+7.6
③1.55×
3
22
-
3
22
×
9
20

④(12×
5
6
-7.3)÷
9
4

3
5
÷[
7
8
-(
2
5
+
3
8
)].
①10944÷36×25-758,
=304×25-758,
=7600-758,
=6842;

②132.5-18÷7.5+7.6,
=132.5-2.4+7.6,
=137.7;

③1.55×
3
22
-
3
22
×
9
20

=
3
22
×(1.55-
9
20
),
=
3
22
×(1.55-0.45),
=
3
22
×1.1,
=
3
20


④(12×
5
6
-7.3)÷
9
4

=(10-7.3)÷
9
4

=2.7×
4
9

=1.2;

3
5
÷[
7
8
-(
2
5
+
3
8
)],
=
3
5
÷[
7
8
-
3
8
-
2
5
],
=
3
5
÷[
1
2
-
2
5
],
=
3
5
÷
1
10

=
3
5
×10,
=6.
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