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設第一個是x,第二個是y 由前兩數之和比後兩個數之和小3得 x+y+3=y+(-2) 左右y約去,得 x+3=-2 x=-5 又因為數之和為0得 -5+y+(-2)=0 所以y=7. 所以答案是 -5 7 -2
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