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HW1

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Q:七邊形的內角和? 一個七邊形裡頭可以劃分成五個三角形, 內角和= ANS:
Q:x+y=3、x-y=1求x、y的值? 利用加減消去法, x+y=3---(1)、x-y=1---(2) (1)-(2) 2y=2 y=1---(3) (3)帶入(1) x+1=3 x...

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HW1