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5x+3y=52 25x+15y=260 11x+5y=81 33x+15y=243 兩式相减 33x-25x=243-260 8x=-17 x=-17/8 3y=52-5x=52+85/8=501/8 y=167/8 如果本題有什麼不明白可以追問,
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