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Key Stage 3 (Junior Secondary)‎ > ‎3.1 Number & Algebra 數與數系‎ > ‎Identities 恒等式‎ > ‎

Sum of Two Squares and Perfect Squares 完全平方公式

http://www.geogebratube.org/material/show/id/17565 (Download GeoGebra file)

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