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我也不確定對不對··· 解設:3x+5y=m+2為:① 2x+3y=m為:② ①-②,得:x+2y=2為:③ 設x+y=2為④ ③-④,得:y=0∴x=2 y=0是原方程的解. 把x=2 y=0代入原方程,得:m=4 當m=4時 原式=m²;-2m+1 =9
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