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討論串[問題] 十字交乘法
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Hi, my LaTeX friend. 1. Yes, the target you showed can be achieved by the method provided yesterday.. 2. This is the simplest way to get your goal sin
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OK, for your reference. Assume (x+a)(x+b) is an example, giving you 4 corners. \begin{picture}. \unitlength=1cm. \put(x,y){\makebox(0,0){objects}} % o
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