题目内容

怎样算简便就怎样算.
1.28+9.8+7.72+10.2    
1
2
×
11
20
+
1
2
×
20
49
1
3
÷(
2
3
-
2
5
)×
3
5
7
8
×[
6
7
-(
1
21
+
3
7
)]
(80-9.8)×0.6-2.1
1
3
-
1
5
)×45.
(1)1.28+9.8+7.72+10.2,
=(1.28+7.72)+(9.8+10.2),
=9+20,
=29;

(2)
1
2
×
11
20
+
1
2
×
20
49

=
1
2
×(
11
20
+
20
49
),
=
1
2
×
939
980

=
939
1960


(3)
1
3
÷(
2
3
-
2
5
)×
3
5

=
1
3
÷
4
15
×
3
5

=
1
3
×
15
4
×
3
5

=
5
4
×
3
5

=
3
4


(4)
7
8
×[
6
7
-(
1
21
+
3
7
)],
=
7
8
×[
6
7
-
10
21
],
=
7
8
×
8
21

=
1
3


(5)(80-9.8)×0.6-2.1,
=70.2×0.6-2.1,
=42.12-2.1,
=40.02;

(6)(
1
3
-
1
5
)×45,
=
1
3
×45-
1
5
×45,
=15-9,
=6.
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