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Key Stage 4 (Senior Secondary)‎ > ‎4.1 Number & Algebra 數與代數‎ > ‎Arithmetic and geometric sequences and their summations 等差數列和等比數列及其求和法‎ > ‎

Triangle Numbers and Sum of Odd Numbers 三角形數及首n個奇數之和

By Alex Chik in GeoGebraTube.

Triangle Number: http://www.geogebratube.org/material/show/id/18784 (Download GeoGebra file)

首n個奇數之和

Sum of the First n Odd Numbers: http://www.geogebratube.org/material/show/id/18791 (Download GeoGebra file)


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