[請益] 數學一題
手機發文請見諒!
題目:
http://miupix.cc/pm-H9HWMQ
詳解: http://miupix.cc/pm-FN9CWV
剛剛翻了課本+參考書都只有看到三角型才要X1/2
為啥這裡的四邊型也要X1/2?
而且課本裡也沒詳解裡用的公式
請高手解釋一下公式來源和為何要X1/2 謝謝!
P.S. I'm soooooo nervous now!!!!!
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