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观察下列各式:13+23=14×4×9=14×22×3213+23+33=36=14×9×16=14×32×4213+23+33+43=100=14×16×25=14×42×52(1)计算:13+23+33+43+…+103的值;(2)猜想:13+23+33+43+…+n3的值.(3)计算:513+523+533+…+993+1003的值

题目详情
观察下列各式:
13+23=
1
4
×4×9=
1
4
×22×32
13+23+33=36=
1
4
×9×16=
1
4
×32×42
13+23+33+43=100=
1
4
×16×25=
1
4
×42×52
(1)计算:13+23+33+43+…+103的值;
(2)猜想:13+23+33+43+…+n3的值.
(3)计算:513+523+533+…+993+1003的值.
观察下列各式:
13+23=
1
4
×4×9=
1
4
×22×32
13+23+33=36=
1
4
×9×16=
1
4
×32×42
13+23+33+43=100=
1
4
×16×25=
1
4
×42×52
(1)计算:13+23+33+43+…+103的值;
(2)猜想:13+23+33+43+…+n3的值.
(3)计算:513+523+533+…+993+1003的值.

33
1
4
×4×9=
1
4
×22×32
13+23+33=36=
1
4
×9×16=
1
4
×32×42
13+23+33+43=100=
1
4
×16×25=
1
4
×42×52
(1)计算:13+23+33+43+…+103的值;
(2)猜想:13+23+33+43+…+n3的值.
(3)计算:513+523+533+…+993+1003的值.
1
4
141144
1
4
×22×32
13+23+33=36=
1
4
×9×16=
1
4
×32×42
13+23+33+43=100=
1
4
×16×25=
1
4
×42×52
(1)计算:13+23+33+43+…+103的值;
(2)猜想:13+23+33+43+…+n3的值.
(3)计算:513+523+533+…+993+1003的值.
1
4
14114422
333
1
4
×9×16=
1
4
×32×42
13+23+33+43=100=
1
4
×16×25=
1
4
×42×52
(1)计算:13+23+33+43+…+103的值;
(2)猜想:13+23+33+43+…+n3的值.
(3)计算:513+523+533+…+993+1003的值.
1
4
141144
1
4
×32×42
13+23+33+43=100=
1
4
×16×25=
1
4
×42×52
(1)计算:13+23+33+43+…+103的值;
(2)猜想:13+23+33+43+…+n3的值.
(3)计算:513+523+533+…+993+1003的值.
1
4
14114422
3333
1
4
×16×25=
1
4
×42×52
(1)计算:13+23+33+43+…+103的值;
(2)猜想:13+23+33+43+…+n3的值.
(3)计算:513+523+533+…+993+1003的值.
1
4
141144
1
4
×42×52
(1)计算:13+23+33+43+…+103的值;
(2)猜想:13+23+33+43+…+n3的值.
(3)计算:513+523+533+…+993+1003的值.
1
4
14114422
33333
33333
33333
▼优质解答
答案和解析
(1)133+233+333+433+…+1033
=
1
4
×102×112
=3025;
(2)由题意可得,
13+23+33+43+…+n3=
1
4
×n2×(n+1)2;
(3)513+523+533+…+993+1003
=13+23+33+43+…+1003-(13+23+33+43+…+503
=
1
4
×1002×1012-
1
4
×502×512
=23876875.
1
4
14111444×102×112
=3025;
(2)由题意可得,
13+23+33+43+…+n3=
1
4
×n2×(n+1)2;
(3)513+523+533+…+993+1003
=13+23+33+43+…+1003-(13+23+33+43+…+503
=
1
4
×1002×1012-
1
4
×502×512
=23876875.
2×112
=3025;
(2)由题意可得,
13+23+33+43+…+n3=
1
4
×n2×(n+1)2;
(3)513+523+533+…+993+1003
=13+23+33+43+…+1003-(13+23+33+43+…+503
=
1
4
×1002×1012-
1
4
×502×512
=23876875.
2
=3025;
(2)由题意可得,
133+233+333+433+…+n33=
1
4
×n2×(n+1)2;
(3)513+523+533+…+993+1003
=13+23+33+43+…+1003-(13+23+33+43+…+503
=
1
4
×1002×1012-
1
4
×502×512
=23876875.
1
4
14111444×n2×(n+1)2;
(3)513+523+533+…+993+1003
=13+23+33+43+…+1003-(13+23+33+43+…+503
=
1
4
×1002×1012-
1
4
×502×512
=23876875.
2×(n+1)2;
(3)513+523+533+…+993+1003
=13+23+33+43+…+1003-(13+23+33+43+…+503
=
1
4
×1002×1012-
1
4
×502×512
=23876875.
2;
(3)5133+5233+5333+…+9933+10033
=133+233+333+433+…+10033-(133+233+333+433+…+5033)
=
1
4
×1002×1012-
1
4
×502×512
=23876875.
1
4
14111444×1002×1012-
1
4
×502×512
=23876875.
2×1012-
1
4
×502×512
=23876875.
2-
1
4
14111444×502×512
=23876875.
2×512
=23876875.
2
=23876875.