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類(1)求通過點(2,1)且斜率為2的直線方程式。

腳:斜率: --a=-2. | L:-2x+5y-5=0 = y截距1=b. 平移後L':-2x+(y-1)-5=0,即2x-5y+10=0. | |-3|2||. →所圍面積: _=5=c. (2) Ac = 1-8. 7. 類如圖,將坐標平面上A,B,C,D,E ...

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