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计算,能简算的要简算,并写出主要过程.306÷(201×47-9413)15÷[(23+15)×113](38×35+35×58)÷572007×2009×(12007×2008+12008×2009)53.7×5.3+537×0.37+53.721×2+22×3+23×4+…+22008×2009.

题目详情
计算,能简算的要简算,并写出主要过程.
306÷(201×47-9413)
1
5
÷[(
2
3
+
1
5
1
13
]
3
8
×35+35×
5
8
5
7
           
2007×2009×(
1
2007×2008
+
1
2008×2009
)
53.7×5.3+537×0.37+53.7      
2
1×2
+
2
2×3
+
2
3×4
+…+
2
2008×2009
▼优质解答
答案和解析
(1)306÷(201×47-9413),
=306÷(9447-9413),
=306÷34,
=9;

(2)
1
5
÷[(
2
3
+
1
5
)×
1
13
],
=
1
5
÷[
13
15
×
1
13
],
=
1
5
÷
1
15

=
1
5
×15,
=3;

(3)
3
8
×35+35×
5
8

=(
3
8
+
5
8
)×35,
=1×35,
=35;

(4)2007×2009×(
1
2007×2008
+
1
2008×2009
),
=2007×2009×
1
2007×2008
+2007×2009×
1
2008×2009

=
2009
2008
+
2007
2008

=1+
1
2008
+(1-
1
2008
),
=2;

(5)53.7×5.3+537×0.37+53.7,
=53.7×5.3+53.7×3.7+53.7,
=(5.3+3.7+1)×53.7,
=10×53.7,
=537;

(6)
2
1×2
+
2
2×3
+
2
3×4
+…+
2
2008×2009

=2×(
1
1×2
+
1
2×3
+
1
3×4
作业帮用户 2016-11-19