اثر نموذج فان هايل في تنمية مهارات التفكير الهندسي و الاحتفاظ بها لدى طلاب الصف التاسع

235 Pages · 2009 · 1.21 MB · Arabic
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“ Raise your words, not voice. It is rain that grows flowers, not thunder. ” ― Rumi
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