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設這四個有理數分別是a、b、c、d a+b+c=3① b+c+d=5② c+d+a=13③ d+a+c=15④ 四式相加得3(a+b+c+d)=3+5+13+15=36 所以a+b+c+d=12⑤ ⑤-②得a=7 ⑤-③得b=-1 ⑤-④得c=-3 ⑤-①得d=9 abcd=189 所以這四個數的積是189
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