1/1x2 + 1/2x3 + 1/3x4 +...+1/19x20(急)
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1/1x2 + 1/2x3 + 1/3x4 +...+1/19x20(急)
1/1x2 + 1/2x3 + 1/3x4 +...+1/19x20
(急)
1/1x2 + 1/2x3 + 1/3x4 +...+1/19x20(急)
1/1x2 + 1/2x3 + 1/3x4 +...+1/19x20
=1-1/2+1/2-1/3+1/3-1/4+……+1/19-1/20
=1-1/20
=19/20
=1-1/2+1/2-1/3+1/3-1/4+...+1/19-1/20
=1-1/20
19/20
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