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计算:12+221×2+22+322×3+32+423×4+42+524×5+…+20122+201322012×2013=.
题目详情
计算:
+
+
+
+…+
=______.
+
+
+
+…+
=______.
12+22 12+22 12+2212+222+22222221×2 1×2
22+32 22+32 22+3222+322+32323222×3 2×3
32+42 32+42 32+4232+422+42424223×4 3×4
42+52 42+52 42+5242+522+52525224×5 4×5
20122+20132 20122+20132 20122+2013220122+201322+20132201322013222012×2013 2012×2013
12+22 |
1×2 |
22+32 |
2×3 |
32+42 |
3×4 |
42+52 |
4×5 |
20122+20132 |
2012×2013 |
12+22 |
1×2 |
22+32 |
2×3 |
32+42 |
3×4 |
42+52 |
4×5 |
20122+20132 |
2012×2013 |
12+22 |
1×2 |
22+32 |
2×3 |
32+42 |
3×4 |
42+52 |
4×5 |
20122+20132 |
2012×2013 |
▼优质解答
答案和解析
+
+
+
+…+
,
=(2+
)+(2+
)+…+(2+
),
=2×2012+(1-
),
=4024+
,
=4024
.
12+22 12+22 12+222+2221×2 1×2 1×2+
22+32 22+32 22+322+3222×3 2×3 2×3+
32+42 32+42 32+422+4223×4 3×4 3×4+
42+52 42+52 42+522+5224×5 4×5 4×5+…+
20122+20132 20122+20132 20122+201322+2013222012×2013 2012×2013 2012×2013,
=(2+
)+(2+
)+…+(2+
),
=2×2012+(1-
),
=4024+
,
=4024
.
1 1 11×2 1×2 1×2)+(2+
)+…+(2+
),
=2×2012+(1-
),
=4024+
,
=4024
.
1 1 12×3 2×3 2×3)+…+(2+
),
=2×2012+(1-
),
=4024+
,
=4024
.
1 1 12012×2013 2012×2013 2012×2013),
=2×2012+(1-
),
=4024+
,
=4024
.
1 1 12013 2013 2013),
=4024+
,
=4024
.
2012 2012 20122013 2013 2013,
=4024
.
2012 2012 20122013 2013 2013.
12+22 |
1×2 |
22+32 |
2×3 |
32+42 |
3×4 |
42+52 |
4×5 |
20122+20132 |
2012×2013 |
=(2+
1 |
1×2 |
1 |
2×3 |
1 |
2012×2013 |
=2×2012+(1-
1 |
2013 |
=4024+
2012 |
2013 |
=4024
2012 |
2013 |
12+22 |
1×2 |
22+32 |
2×3 |
32+42 |
3×4 |
42+52 |
4×5 |
20122+20132 |
2012×2013 |
=(2+
1 |
1×2 |
1 |
2×3 |
1 |
2012×2013 |
=2×2012+(1-
1 |
2013 |
=4024+
2012 |
2013 |
=4024
2012 |
2013 |
1 |
1×2 |
1 |
2×3 |
1 |
2012×2013 |
=2×2012+(1-
1 |
2013 |
=4024+
2012 |
2013 |
=4024
2012 |
2013 |
1 |
2×3 |
1 |
2012×2013 |
=2×2012+(1-
1 |
2013 |
=4024+
2012 |
2013 |
=4024
2012 |
2013 |
1 |
2012×2013 |
=2×2012+(1-
1 |
2013 |
=4024+
2012 |
2013 |
=4024
2012 |
2013 |
1 |
2013 |
=4024+
2012 |
2013 |
=4024
2012 |
2013 |
2012 |
2013 |
=4024
2012 |
2013 |
2012 |
2013 |
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