TIMSS 2015國中小數學與科學教學及其相關因素（1） Mathematics and science teaching and relating factors in Taiwan's elementary and junior high schools in TIMSS 2015(I)
觀察到以北極星為圓心，的同心圓星星完整圓形軌跡或圓的部份弧形軌跡之地理條件 Geological conditions for observing stars with either circular or arc-wise concentric tracks centered at the Polaris
尋找出能使cosA+cosB+cosC的有理數值相等的相異整數邊長ΔABC Searching for the integer side length's trianglesΔABC that make cosA+cosB+cosC have equal rational number value
