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設爸爸x,小麗y,小剛z,(1)x+y=58(2)x-z=25(3)z-y=3 採用消元法計算:先消去x,(1)-(2)得:y+z=33再消去y,(2)+(3)得:2z=36 z=18 最後分別代入,得y=15 x=43 爸爸43歲,小麗15歲,小剛18歲
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