试题:
递等式计算:
1
8
÷〔(2.4-2.4×
1
8
)÷
3
5
+
4
5

4
1
4
×
9
20
+2
1
4
÷2
2
9
-1
1
2
×45%
1
27
+
505
2727
+
131313
272727
+
35353535
27272727
=
1
100
+
2
100
+
3
100
+…+
98
100
+
99
100
=
2002×2001-2001×2000+2000×1999-1999×1998+1998×1997-1997×1996+…+4×3-3×2+2×1=

答案:

我来补答
(1)
1
8
÷[(2.4-2.4×
1
8
)÷
3
5
+
4
5
]
=
1
8
÷[(2.4-0.3)×
5
3
+
4
5
],
=
1
8
÷[2.1×
5
3
+0.8],
=
1
8
÷[3.5+0.8],
=0.125÷4.3,
=
5
172


(2)4
1
4
×
9
20
+2
1
4
÷2
2
9
-1
1
2
×45%
=4
1
4
×
9
20
+2
1
4
×
9
20
-1
1
2
×
9
20

=(4
1
4
+2
1
4
-1
1
2
)×
9
20

=5×
9
20

=
9
4


(3)
1
27
+
505
2727
+
131313
272727
+
35353535
27272727

=
1
27
+
101×5
101×27
+
13×10101
10101×27
+
1010101×35
1010101×27

=
1
27
+
5
27
+
13
27
+
35
27

=2;

(4)
1
100
+
2
100
+
3
100
+…+
98
100
+
99
100

=
1+2+3+…+99
100

=
(1+99)×99÷2
100

=
100×99÷2
100

=45.5;

(5)2002×2001-2001×2000+2000×1999-1999×1998+1998×1997-1997×1996+…+4×3-3×2+2×1
=(2002-2000)×2001+(2000-1998)×1999+…+(4-2)×3+2×1,
=2001×2+1999×2+…3×2+2×1,
=(2001+1999+…3+1)×2,
=(2001+1)×[(2001-1)÷2+1]÷2×2,
=2002×1001÷2×2,
=2004002.
 
 
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