题目内容

计算下列各题(能简算的要简算)
2
3
+
2
15
)×45        
3
13
×
2
5
+
10
13
×0.8-0.8
0.25×
5
8
×4×1.6      
(1
1
2
+2.25)÷〔(3
1
3
-1
1
2
)÷1
2
9
(1)(
2
3
+
2
15
)×45,
=
2
3
×45+
2
15
×45,
=30+6,
=36;

(2)
3
13
×
2
5
+
10
13
×0.8-0.8,
=
3
13
×
2
5
+
10
13
×2×
2
5
-2×
2
5

=
2
5
×(
3
13
+
20
13
-2),
=
2
5
×(-
3
13
),
=-
6
65


(3)0.25×
5
8
×4×1.6,
=(0.25×4)×(
5
8
×1.6),
=1×1,
=1;

(4)(1
1
2
+2.25)÷[(3
1
3
-1
1
2
)÷1
2
9
],
=(1.5+2.25)÷[
11
6
×
9
11
],
=3.75÷
3
2

=3.75×
2
3

=2.5.
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