abcd-abc-ab-a=1987 求abcd
abcd-abc-ab-a=1987 求abcd
其他人氣：187 ℃時間：2020-03-29 02:28:58
優(yōu)質解答
(1000-100-10-1)a+(100-10-1)b+(10-1)c+d=1987 889a+89b+9c+d=1987(1=
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