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การบวกจำนวนเต็มบวกกับจำนวนเต็มลบ
Author:
Waleerat Wongwean
Discover Resources
fcdvhb
Patterns
Pythagorean Theorem
Portfolio Math 3
Mosaics
New Resources
MaggieBerkley_NumericalInvariantsA
LilyRamras_NumericalInvariantsD
Integral vs Midpoint Rectangle Sum
sine & cosine of 30º and 60º
Catriona Shearer's Parallelogram Puzzle
